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WO2007097817A2 - High strength, high toughness, weldable, ballistic quality, castable aluminum alloy, heat treatment for same and articles produced from same - Google Patents

High strength, high toughness, weldable, ballistic quality, castable aluminum alloy, heat treatment for same and articles produced from same Download PDF

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Publication number
WO2007097817A2
WO2007097817A2 PCT/US2006/060675 US2006060675W WO2007097817A2 WO 2007097817 A2 WO2007097817 A2 WO 2007097817A2 US 2006060675 W US2006060675 W US 2006060675W WO 2007097817 A2 WO2007097817 A2 WO 2007097817A2
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weight
aluminum alloy
cast
product
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PCT/US2006/060675
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WO2007097817A3 (en
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Alan Druschitz
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Bac Of Virginia
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/12Alloys based on aluminium with copper as the next major constituent
    • C22C21/16Alloys based on aluminium with copper as the next major constituent with magnesium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/12Alloys based on aluminium with copper as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/057Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with copper as the next major constituent

Definitions

  • This invention relates to 1 ) an aluminum alloy for casting operations, such as sand, investment or permanent mold casting operations, 2) a heat treatment process for aluminum alloys and 3) the application of the newly invented aluminum alloy casting alloy for cast products for racing, aerospace and military (land, sea and air) applications.
  • Aluminum alloy casting alloys 354, C355, A356 and A357 have good castability but do not have good mechanical properties.
  • Aluminum alloy casting alloys A201 and A206 have good mechanical properties but do not have good castability, good resistance to stress corrosion cracking or good weldability. Both A201 and A206 alloy have poor fluidity and poor resistance to hot tearing during casting.
  • the ASTM does not list A206 alloy as an aluminum alloy sand casting or high- strength aluminum alloy.
  • Aluminum alloy wrought alloy 2519 is currently the premier aluminum alloy wrought alloy because of its excellent tensile strength and ballistic qualities.
  • aluminum alloy wrought alloy 2519 requires "stretching" to achieve these properties (see e.g. US Patent No. 4,610,733, entitled “High Strength Weldable Aluminum Base Alloy Product and Method of Making Same” and issued Sept. 9, 1986 to Sanders, Jr., et al.). Because "stretching" is a cold working process, the benefit of stretching is lost if the product is welded or heat treated after "stretching". Further, products that are cast to shape cannot be “stretched”.
  • US Patent No. 2,706,680 (entitled “Aluminum Base Alloy” and issued April 19, 1955 to Criner) describes aluminum base alloys that are adapted for service at elevated temperatures, particularly such as required in certain parts of jet engines.
  • This patent discloses a magnesium-free aluminum base alloy containing copper as the chief added component and small amounts of manganese, vanadium and zirconium which displays a combination of strength and resistance to fatigue and creep at high temperatures. More specifically the aluminum alloy includes from 5 to 13% copper, 0.15 to 1.7% manganese, 0.05 to 0.20% vanadium, 0.05 to 0.30% zirconium, with an iron impurity not exceeding 0.75% and a silicon impurity not exceeded 0.40%.
  • the disclosed alloy contains no more than about 0.02% magnesium, hence it is referred to as being "magnesium-free".
  • To obtain a finer grain size or enhance minor characteristics of the alloy it is disclosed to be desirable to add 0.01 to 0.25% of one or more of the following elements: cobalt, nickel, molybdenum, tungsten, chromium, titanium, boron, tantalum and niobium.
  • the thermal treatment disclosed to enhance the alloy properties consists of heating to a temperature between 960 and 1000 0 F for a period of 2 to 24 hours followed by quenching, preferably in water at 70 to 16O 0 F. The quenched alloys are then reheated to 350 to 45O 0 F for a period of 1 to 50 hours.
  • US Patent No. 2,784,126 (entitled “Aluminum Base Alloy” and issued Mar. 5, 1957 to Criner) is similar to US Patent No. 2,706,680 (discussed above) and discloses an aluminum base alloy that is adapted for service at elevated temperatures.
  • the disclosed chemistry of the alloy consists of from 5 to 13% copper, 0.15 to 1.7% manganese, 0.05 to 0.20% vanadium, 0.05 to 0.30% zirconium and the addition of 0.05 to 0.70% magnesium.
  • the disclosed addition of magnesium is claimed to improve the strength and resistance to creep and fatigue at high temperatures.
  • samples were cast in the form of ingots and forged to 1 " square bars. The bars were given a solution heat treatment of 2 hours at 990 - 1000 0 F, quenched in cold water and precipitation hardened by heating them for 12 hours at
  • the disclosed room temperature properties of an alloy of composition 5.98 wt% Cu, 0.1 1 wt% Fe, 0.07 wt% Si, 0.21 wt% Mn, 0.10 wt% V and 0.23 wt% Zr are an average ultimate tensile strength of 61 ,600 psi, an average 0.2% offset yield strength of 43,000 psi and an average elongation of 17%.
  • the disclosed room temperature properties of an alloy of composition 6.09 wt% Cu, 0.15 wt% Fe, 0.1 1 wt% Si, 0.32 wt% Mn, 0.18 wt% V, 0.20 wt% Zr and 0.25 wt% Mg are an average ultimate tensile strength of 71 ,100 psi, an average 0.2% offset yield strength of 55,700 psi and an average elongation of 13%.
  • forging was required to increase the density of the disclosed aluminum alloy. This patent does not disclose information on the properties of castings made from the disclosed alloy.
  • HIP hot isostatic pressing
  • a casting is made from an aluminum alloy containing, in weight percent:
  • the aluminum alloy casting is solution heat treated, then hot isostatically pressed, then solution heat treated again. This process produces a cast product having a multitude of second phase particles, and in particular a cast product in which an interdendritic network of second phase particles is eliminated.
  • the aluminum alloy casting is solution heat treated at 950 - 96O 0 F (510 - 516 0 C) for 2 - 4 hours followed by 980 - 1005 0 F (527 - 541 0 C) for 16 - 120 hours followed by quenching in water, hot isostatically pressed (HIP) at 950 - 975 0 F (510 - 524 0 C) and 15,000 ⁇ 500 psi (103 ⁇ 3.4 MPa) for 2 to 3 hours, solution heat treated at 950 - 96O 0 F (510 - 516 0 C) for 2 - 4 hours followed by 980 - 1005 0 F (527 - 541 0 C) for 16 - 120 hours followed by quenching in water and aged.
  • the casting may be either naturally aged at room temperature or artificially aged at 310 - 39O 0 F (154 - 199 0 C) for 1 to 96 hours.
  • the resulting aluminum alloy product in the naturally aged condition T4 has a minimum ultimate tensile strength of 57,100 psi (394 MPa), a minimum 0.2% offset yield strength of 38,500 psi (265 MPa), a minimum elongation of 6.2%, a minimum unnotched impact strength of 88 joules/cm 2 and passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 30,000 psi (207 MPa).
  • the resulting aluminum alloy product in the artificially aged condition T6 has a minimum ultimate tensile strength of 66,100 psi (458 MPa), a minimum 0.2% offset yield strength of 47,800 psi (330 MPa) and a minimum elongation of 3.1 %.
  • the resulting aluminum alloy product in the artificially aged condition T7 has a minimum ultimate tensile strength of 48,600 psi (335 MPa), a minimum 0.2% offset yield strength of 43,900 psi (303 MPa), a minimum elongation of 1.0%, a minimum unnotched impact strength of 28 joules/cm 2 and passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 40,000 psi (276 MPa).
  • the resulting aluminum alloy product in the artificially aged condition T61 has an average ultimate tensile strength of 69,660 psi (480 MPa), an average 0.2% offset yield strength of 59,390 psi (409 MPa), an average elongation of 6.3% and an average unnotched impact strength of 41 joules/cm 2 and has similar ballistic performance to aluminum alloy wrought alloy 2519 in the T87 condition.
  • the aluminum alloy casting alloy of the present invention is desirable because it is weldable and retains the desired properties when heat treated after welding.
  • Fig. 1 is a picture of a seat frame cast with a prior art aluminum alloy
  • Fig. 2 is a picture of a seat frame cast with an aluminum alloy according to principles of the present invention
  • Fig. 3 is a picture of a single plate of a known aluminum alloy wrought alloy and a single plate of the aluminum cast alloy according to the present invention after ballistic testing;
  • Fig. 4 is a picture of a double plate of a known aluminum alloy wrought alloy and a double plate of the aluminum cast alloy according to the present invention after ballistic testing.
  • Aluminum alloy casting alloys A201 and A206 were purchased as ingots from a supplier.
  • the aluminum alloy casting alloy in the illustrated embodiment was produced using A206 ingot with addition of aluminum-copper, aluminum-manganese, aluminum- chromium, aluminum-vanadium, aluminum-zirconium master alloys and pure magnesium.
  • Commercially available aluminum-titanium-boron and aluminum-titanium- carbon grain refiners were used.
  • Table 7 The chemical compositions of a plurality of aluminum alloy casting alloys produced are shown in Table 7. In Table 7, the columns represent a weight percentage of the indicated element and each row represents one mixture of the constituent elements, termed a heat and designated by a letter A through W.
  • the castability of the aluminum alloy casting alloys of the illustrated embodiment is determined by qualitatively comparing the fluidity and hot tearing tendency of A201 and A206 alloys to that of the illustrated embodiment.
  • a complex seat frame casting that has thick and thin sections is poured from each alloy at various temperatures in chemically bonded sand molds that contain aluminum chills. Pictures of such seat frame castings are shown in Fig. 1 and Fig. 2.
  • Aluminum alloy casting alloys A201 and A206 typically have very limited pouring temperature ranges since 1 ) the alloy must be poured at a temperature sufficiently high to completely fill the mold but 2) the alloy must be poured at as low a temperature as possible to prevent hot tearing.
  • good castings could not be produced in aluminum alloy casting alloy A206.
  • Good castings could be produced in aluminum alloy casting alloy A201 when poured in the temperature range 1350-1360 0 F.
  • Good castings could be produced in the aluminum alloy casting alloy of this embodiment (Heats A, B, D & E) when poured in the temperature range 1330-138O 0 F, a wider temperature range than with aluminum alloy casting alloy A201.
  • Good seat frame castings could not be poured from Heat C.
  • an aluminum alloy casting alloy should have a minimum copper content of about 5.20 wt% to produce good fluidity and good resistance to hot tearing.
  • Seat frame castings were not poured from Heats F-W.
  • FIG. 1 An example of an aluminum alloy casting alloy A206 casting with hot tears is shown in Fig. 1 and an example of a good casting poured in the aluminum alloy casting alloy of the illustrated embodiment is shown in Fig. 2.
  • the larger pouring range of the aluminum alloy casting alloy of the illustrated embodiment is due to improved fluidity (ability to flow and fill a mold) and improved feeding (ability to supply metal during liquid contraction and the liquid-to-solid phase transformation). Good castability allows the production of complex castings at low scrap rates and, therefore, minimum cost.
  • the aluminum alloy casting alloy of the illustrated embodiment is processed using a pre-HIP solution heat treatment. That is, instead of applying a HIP process to the cast product, that product is first heat treated.
  • the mechanical properties of an aluminum alloy cast product are determined by soundness, chemistry and microstructure. Soundness is a measure of porosity, which is determined by the feeding characteristics of the aluminum alloy cast alloy. Soundness can be improved by hot isostatic pressing (HIP) the cast product.
  • the chemistry of the aluminum alloy cast alloy ultimately determines what microstructural phases can be produced.
  • the size, quantity and distribution of the microstructural phases and porosity determine the mechanical properties.
  • the size, quantity and distribution of the microstructural phases are determined by heat treatment.
  • the aluminum alloy casting alloys of the illustrated embodiment produced less porosity than A201 but more porosity than A206 alloy.
  • the average porosity for A201 alloy was 3.2%
  • for A206 alloy was 0.5%
  • for the aluminum alloy casting alloy of the illustrated embodiment was 1.5%.
  • the aluminum alloy casting alloy of the illustrated embodiment produced better mechanical properties compared to A201 alloy.
  • Table 8 compares the mechanical properties of samples cut from seat frame castings produced from aluminum alloy casting alloy A201 and aluminum alloy casting alloy of heat A of the illustrated embodiment.
  • Hot isostatic pressing is a well known, commercial process for reducing the porosity in castings. HIP'ing is typically performed before any other heat treatment. In the illustrated embodiment, however, solution heat treatment performed before HIP'ing produces improved mechanical properties, particularly improved resistance to stress corrosion cracking. However, solution heat treatment before HIP'ing is not a requirement to produce satisfactory properties using the aluminum alloy casting alloy of the illustrated embodiment.
  • Sections were cut from castings produced from the aluminum alloy casting alloy of the illustrated embodiment and heat treated in various ways to quantitatively determine the effect of HIP'ing and heat treatment cycle on mechanical properties.
  • the heat treatment cycles were: (1 ) a long pre-HIP solution heat treatment at 950 - 96O 0 F (510 - 516 0 C) for 2 - 4 hours followed by 990 - 995 0 F (532 - 535 0 C) for 68 - 96 hours followed by quenching in water, followed by HIP'ing at 950 - 975 0 F (510 - 524 0 C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours, followed by a post-HIP solution heat treatment (see below) and age; (2) a short pre-HIP solution heat treatment at 950 - 96O 0 F (510 - 516 0 C) for 2 - 4 hours followed by 990 - 995 0 F for 16-20 hours followed by quenching in water, followed by HIP'ing at 950 - 975 0 F (510 - 524 0 C), 15,000 +/- 500 psi (103 +/
  • the T4 condition was produced by post-HIP solution heat treatment at 950 - 96O 0 F (510 - 516 0 C) for 2 - 4 hours followed by 990 - 995 0 F (532 - 535 0 C) for 16-20 hours followed by quenching in warm water at 120 - 18O 0 F (49 - 82 0 C) and then naturally aging at room temperature for a minimum of seven days before testing.
  • the T6 condition was produced by post-HIP solution heat treatment at 950 - 96O 0 F (510 - 516 0 C) for 2 - 4 hours followed by 990 - 995 0 F (532 - 535 0 C) for 16-20 hours followed by quenching in warm water at 120 - 18O 0 F (49 - 82 0 C), naturally aging at room temperature for 8 - 24 hours and then artificially aging at 325 0 F (163 0 C) for 24 hours.
  • Material heat treated to the T6 condition exhibited the best combination of strength and ductility: HIP'ing increased the tensile ductility by 60 to 101 %.
  • the T61 condition was produced by post-HIP solution heat treatment at 950 - 96O 0 F (510 - 516 0 C) for 2 - 4 hours followed by 990 - 995 0 F (532 - 535 0 C) for 16-20 hours followed by quenching in warm water at 120 - 18O 0 F (49 - 82 0 C), naturally aging at room temperature for 8 - 24 hours and then artificially aging at 325 0 F (163 0 C) for 36 hours.
  • the T7 condition was produced by post-HIP solution heat treatment at 950 - 96O 0 F (510 - 516 0 C) for 2 - 4 hours followed by 990 - 995 0 F (532 - 535 0 C) for 16-20 hours followed by quenching in warm water at 120 - 18O 0 F (49 - 82 0 C), naturally aging at room temperature for 8 - 24 hours and then artificially aging at 39O 0 F (199 0 C) for 24 hours.
  • the aluminum alloy cast alloy of the illustrated embodiment has improved yield (design) strength in all heat treatment conditions. Also, the tensile ductility increased by 167% when subjected to the short solution heat treatment, followed by HIP'ing, followed by the T6 heat treatment. For comparison, sections from seat frame castings of each alloy were heat treated using identical processing conditions (e.g. solution heat treated, HIP'ed or not HIP'ed, then T6) and the results are listed in Table 10.
  • the heat treatment cycle was a long pre-HIP solution heat treatment at 950 - 96O 0 F (510 - 516 0 C) for 2 - 4 hours followed by 990 - 995 0 F (532 - 535 0 C) for 96 - 120 hours followed by quenching in water, HIP'ing at 950 - 975 0 F (510 - 524 0 C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours, followed by a post-HIP solution heat treatment and age.
  • the T4 condition was produced by post-HIP solution heat treatment at 950 - 96O 0 F (510 - 516 0 C) for 2 - 4 hours followed by 990 - 995 0 F (532 - 535 0 C) for 16-20 hours followed by quenching in warm water at 120 - 18O 0 F (49 - 82 0 C) and then naturally aging at room temperature for a minimum of seven days before testing.
  • the T6 condition was produced by post-HIP solution heat treatment at 950 -
  • the T7 condition was produced by post-HIP solution heat treatment at 950 -
  • copper content should be limited to about 6.25 wt%
  • chromium content should be limited to about 0.20 wt%
  • magnesium content should be limited to about 0.50 wt%.
  • the addition of silver was shown to significantly increase yield strength.
  • the resulting data shows that ductility (e.g. tensile elongation) decreases as copper content increases, as chromium content increases and as magnesium content increases.
  • ductility e.g. tensile elongation
  • manganese content or vanadium content was shown to decrease yield strength and increase ductility.
  • zirconium content was shown to have an inconsistent effect on mechanical properties.
  • Table 1 The mechanical properties of samples cut from castings produced from the aluminum alloy casting alloy of the illustrated embodiment and heat treated in similar ways are displayed in Table 1 1.
  • the aluminum alloy casting alloy of the illustrated embodiment has good stress corrosion cracking properties that are enhanced when solution heat treated before HIP'ing.
  • Aluminum alloy cast alloys and wrought alloys that contain copper typically have unacceptable stress corrosion cracking properties in the T6 condition but often have acceptable stress corrosion cracking properties in the T4 or T7 conditions.
  • Samples from two heats (Heat B, Heat D) were given a variety of heat treatments and then subjected to the standard stress corrosion cracking test, ASTM G47-98 (2004).
  • the heat subjected to long solution heat treatment prior to HIP'ing (Heat D) exhibited significantly improved resistance to stress corrosion cracking (almost produced "acceptable” results) in the T6 condition.
  • the stress corrosion cracking performance, as determined by ASTM G47-98 (2004), for the two different heat treatment processes and aluminum alloy casting alloys of the illustrated embodiment are displayed in Table 12.
  • the aluminum alloy casting alloy of the illustrated embodiment is weldable. Aluminum alloy casting alloys are not normally welded so little or no published data exists for comparison purposes. However, aluminum alloy wrought alloys are often welded and the aluminum alloy casting alloy of the illustrated embodiment compared favorably to published data for material tested in the heat treated then welded condition. The welder had no prior experience welding the aluminum alloy casting alloy of the illustrated embodiment and very little experience with aluminum alloy 2319 welding wire.
  • the aluminum alloy casting alloy of the illustrated embodiment can be heat treated after welding to develop improved properties. Further, solution treatment after welding but prior to HIP'ing results in significantly improved yield strength. Solution treatment after welding but prior to HIP'ing resulted in an 85% increase in yield strength in the T4 condition and a 27% increase in yield strength in the T6 condition.
  • the aluminum alloy casting alloy of the illustrated embodiment in the T61 condition has ballistic properties similar to aluminum alloy wrought alloy 2519 in the T87 condition.
  • Samples of the aluminum alloy casting alloy of the illustrated embodiment in the T61 condition and aluminum alloy wrought alloy 2519 in the T87 condition were machined to the same size and dimensions and shot at with 0.223 caliber standard rounds at a distance of approximately 50 meters (150 feet).
  • Single plates, 0.5" thick, of the aluminum alloy casting alloy of the illustrated embodiment in the T61 condition and the aluminum alloy wrought alloy 2519 in the T87 condition were completely penetrated, as illustrated in Fig. 3.
  • Fig. 3a is a picture of a single plate of the aluminum alloy casting alloy of the illustrated embodiment after the ballistic testing described above
  • Fig. 3b is a picture of a single plate of the aluminum alloy wrought alloy 2519 after the ballistic testing described above.
  • Double plates of the aluminum alloy casting alloy of the illustrated embodiment in the T61 condition and the aluminum alloy wrought alloy 2519 in the T87 condition were not penetrated after the same ballistic testing described above, as illustrated in Fig. 4.
  • Fig. 4a is a picture of a double plate of the aluminum alloy casting alloy of the illustrated embodiment after the ballistic testing described above
  • Fig. 4b is a picture of a double plate of the aluminum alloy wrought alloy 2519 after the ballistic testing described above.
  • the aluminum alloy casting alloy of the present illustrated embodiment is ideally suited for articles requiring high strength, high toughness, resistance to penetration by ballistic objects, resistance to stress corrosion cracking and light in weight. These articles are commonly used in racing, aerospace and military (land, sea and air) vehicles. Specifically, a seat frame for a military vehicle, (Fig. 1 and Fig. 2), was used as a test casting for developing the aluminum alloy casting alloy of the illustrated embodiment. Light-weight armor, a turret rotor, a turret housing and hatches for a military weapon system, bolts and welding wire are currently being developed and evaluated.
  • the aluminum alloy casting alloy of the illustrated embodiment could be a replacement for aluminum alloy casting alloy A201 , which is currently used for the steering deflector on the AAAV amphibious military vehicle.
  • the applications for the aluminum alloy casting alloy of the illustrated embodiment are not limited to only those articles discussed above.
  • composition for an aluminum alloy casting alloy according to principles of the present invention is as follows:
  • the aluminum alloy casting alloy is grain refined using a 0.04 - 2.00 weight % addition of aluminum-5 weight % titanium-1 weight % boron and a 0.07 - 2.00 weight % addition of aluminum-3 weight % titanium-0.15 weight % carbon containing grain refiner.
  • the aluminum alloy casting alloy is grain refined using a 0.04 - 0.08 weight % addition of aluminum-5 weight % titanium-1 weight % boron and a 0.07 - 0.10 weight % addition of aluminum-3 weight % titanium-0.15 weight % carbon containing grain refiner.
  • a heat treatment for an aluminum alloy casting alloy is as follows: 1. Solution heat treat at 950 - 96O 0 F (510 - 516 0 C) for 2 - 4 hours followed by 980
  • Hot isostatic pressing at 950 - 975 0 F (510 - 524 0 C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours
  • the optimum heat treatment for the aluminum alloy casting alloy is as follows:
  • Hot isostatic pressing at 950 - 975 0 F (510 - 524 0 C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours
  • T4 Naturally age at room temperature
  • T6 Artificially age at 325 0 F (163 0 C) for 24 hours
  • T61 Artificially age at 325-340 0 F (163 - 171 0 C) for 24 - 36 hours;
  • T7 Artificially age at 39O 0 F (199 0 C) for 24 hours.

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Abstract

An aluminum alloy cast product is composed of: Cu 5.00 - 6.75 weight%, Mg 0.05 - 0.50 weight%, Mn 0.05 - 0.65 weight%, Ti 0.05 - 0.40 weight%, Ag 0.00 - 0.40 weight%, Cr 0.00 - 0.20 weight%, V 0.00 - 0.40 weight%, Zr 0.00 - 0.30 weight%, Fe <0.15 weight%, Si <0.15 weight%, Ni <0.05 weight%, Zn <0.05 weight%, impurities <0.05 each weight%, <0.25 total weight%, Al balance. Such an aluminum alloy cast product is heat treated to eliminate the interdendritic network of second phase particles. The heat treatment of such an aluminum alloy casting alloy includes solution heat treatment before hot isostatic pressing.

Description

Aluminum Alloy, Heat Treatment For And Articles Made From Same
FIELD OF THE INVENTION
This invention relates to 1 ) an aluminum alloy for casting operations, such as sand, investment or permanent mold casting operations, 2) a heat treatment process for aluminum alloys and 3) the application of the newly invented aluminum alloy casting alloy for cast products for racing, aerospace and military (land, sea and air) applications.
TERMINOLOGY
Figure imgf000002_0001
BACKGROUND OF THE INVENTION
Only a few aluminum alloy casting alloys have attractive properties for racing, aerospace and military applications. These aluminum alloy casting alloys are commonly designated 354, C355, A356, A357, A201 and A206. However, none of these aluminum alloy casting alloys have the desirable combination of high strength, high ductility, high toughness, good resistance to stress corrosion cracking, good weldability and good castability (i.e. good resistance to hot tearing and good fluidity). Hot tearing is a catastrophic event that occurs during the casting process and renders the cast product unusable. Hot tearing occurs when the metal contraction due to solidification produces tensile stresses higher than the strength of the casting. "Spongy" areas, which have high levels of porosity, due to poor feeding will have low strength and hot spots caused by the combination of thick and thin sections will have high tensile contraction stresses that promote hot tearing.
Aluminum alloy casting alloys 354, C355, A356 and A357 have good castability but do not have good mechanical properties. Aluminum alloy casting alloys A201 and A206 have good mechanical properties but do not have good castability, good resistance to stress corrosion cracking or good weldability. Both A201 and A206 alloy have poor fluidity and poor resistance to hot tearing during casting.
The chemical compositions and mechanical properties of aluminum alloy casting alloys are found in ASTM B26/B26M-99, "Standard Specification for Aluminum-Alloy Sand Castings", Table 1 , and ASTM B686-99, "Standard Specification for Aluminum Alloys Castings, High-Strength", Table 2 and Table 3. A comparison of the castability/fluidity, corrosion resistance and weldability of aluminum alloy casting alloys is shown in Table 4. Table 1 - Chemical compositions of aluminum alloy casting < alloys
Figure imgf000004_0001
a single value denotes the maximum amount permitted
Figure imgf000004_0002
Table 3 - Mechanical properties of aluminum alloy casting alloys
Figure imgf000005_0001
Table 4 - Comparison of the castability/fluidity, corrosion resistance and weldabilit of aluminum allo castin allo s*
Figure imgf000005_0002
* www.sfsa.org/tutorials
The ASTM does not list A206 alloy as an aluminum alloy sand casting or high- strength aluminum alloy.
There are numerous aluminum alloy wrought alloys that have attractive properties for aerospace and military applications but products from these aluminum alloys must be machined from plate or billet, which is extremely time consuming and costly, or must be forged into useful shapes. Some of these aluminum alloy wrought alloys are 2024, 5083, 6061 , 7075, 2219 and 2519.
The chemical compositions and mechanical properties of aluminum alloy wrought alloys are found in ASTM B209/B209M-95, "Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate" and are summarized in Table 5 and Table 6. Table 5 - Chemical com ositions of aluminum allo wrou ht allo s
Figure imgf000006_0001
a single value denotes the maximum amount permitted from MIL-DTL-46192C(MR)
Table 6 - Mechanica properties oi F aluminum alloy wrought alloys
Approximate f Mechanical Property Limits*
Alloy Temper UTS (min), YS (min), Elongation (min), % ksi [MPa) ksi (MPa)
2024 T4 62.0 (427) 40.0 (276) 15
T62 63.0 (434) 50.0 (345) 5
T72 60.0 (414) 46.0 (317) 5
5083 as-cast 40.0 (276) 18.0 (124) 16
6061 T4 30.0 (207) 16.0 (1 10) 16
T62 42.0 (290) 35.0 (241 ) 10
7075 T6 78.0 (538) 68.0 (469) 7
T7651 71.0 (490) 60.0 (414) 5
2219 T31 46.0 (317) 28.0 (193) 10
T62 54.0 (372) 36.0 (248) 8
2519 T871 68.0 (469) 58.0 (400) 7 ***
T871 66.0 (455) 59.0 (407) 10 **** the properties of wrought alloys are a function of thickness * from MIL-DTL-46192C(MR) ** long transverse direction *** longitudinal direction The ASTM does not list 2519 alloy as an aluminum alloy wrought alloy. The chemical composition and mechanical property data for 2519 alloy was taken from MIL- DTL-46192C(MR).
Aluminum alloy wrought alloy 2519 is currently the premier aluminum alloy wrought alloy because of its excellent tensile strength and ballistic qualities. However, aluminum alloy wrought alloy 2519 requires "stretching" to achieve these properties (see e.g. US Patent No. 4,610,733, entitled "High Strength Weldable Aluminum Base Alloy Product and Method of Making Same" and issued Sept. 9, 1986 to Sanders, Jr., et al.). Because "stretching" is a cold working process, the benefit of stretching is lost if the product is welded or heat treated after "stretching". Further, products that are cast to shape cannot be "stretched".
US Patent No. 2,706,680 (entitled "Aluminum Base Alloy" and issued April 19, 1955 to Criner) describes aluminum base alloys that are adapted for service at elevated temperatures, particularly such as required in certain parts of jet engines. This patent discloses a magnesium-free aluminum base alloy containing copper as the chief added component and small amounts of manganese, vanadium and zirconium which displays a combination of strength and resistance to fatigue and creep at high temperatures. More specifically the aluminum alloy includes from 5 to 13% copper, 0.15 to 1.7% manganese, 0.05 to 0.20% vanadium, 0.05 to 0.30% zirconium, with an iron impurity not exceeding 0.75% and a silicon impurity not exceeded 0.40%. The disclosed alloy contains no more than about 0.02% magnesium, hence it is referred to as being "magnesium-free". To obtain a finer grain size or enhance minor characteristics of the alloy it is disclosed to be desirable to add 0.01 to 0.25% of one or more of the following elements: cobalt, nickel, molybdenum, tungsten, chromium, titanium, boron, tantalum and niobium. The thermal treatment disclosed to enhance the alloy properties consists of heating to a temperature between 960 and 10000F for a period of 2 to 24 hours followed by quenching, preferably in water at 70 to 16O0F. The quenched alloys are then reheated to 350 to 45O0F for a period of 1 to 50 hours. Mechanical properties are disclosed for elevated temperatures (400 and 6000F). US Patent No. 2,784,126 (entitled "Aluminum Base Alloy" and issued Mar. 5, 1957 to Criner) is similar to US Patent No. 2,706,680 (discussed above) and discloses an aluminum base alloy that is adapted for service at elevated temperatures. In this patent, the disclosed chemistry of the alloy consists of from 5 to 13% copper, 0.15 to 1.7% manganese, 0.05 to 0.20% vanadium, 0.05 to 0.30% zirconium and the addition of 0.05 to 0.70% magnesium. In this patent, the disclosed addition of magnesium is claimed to improve the strength and resistance to creep and fatigue at high temperatures. In this patent, samples were cast in the form of ingots and forged to 1 " square bars. The bars were given a solution heat treatment of 2 hours at 990 - 10000F, quenched in cold water and precipitation hardened by heating them for 12 hours at
3750F. The disclosed room temperature properties of an alloy of composition 5.98 wt% Cu, 0.1 1 wt% Fe, 0.07 wt% Si, 0.21 wt% Mn, 0.10 wt% V and 0.23 wt% Zr are an average ultimate tensile strength of 61 ,600 psi, an average 0.2% offset yield strength of 43,000 psi and an average elongation of 17%. The disclosed room temperature properties of an alloy of composition 6.09 wt% Cu, 0.15 wt% Fe, 0.1 1 wt% Si, 0.32 wt% Mn, 0.18 wt% V, 0.20 wt% Zr and 0.25 wt% Mg are an average ultimate tensile strength of 71 ,100 psi, an average 0.2% offset yield strength of 55,700 psi and an average elongation of 13%. In this patent, it is presumed that forging was required to increase the density of the disclosed aluminum alloy. This patent does not disclose information on the properties of castings made from the disclosed alloy.
One of the reasons that castings typically have inferior properties compared to wrought products is porosity. However, a low cost process known as hot isostatic pressing (HIP) is available. Use of the HIP process with a proper process cycle can produce significant improvements in mechanical properties of castings with respect to porosity. The industry standard practice is to (1 ) produce a casting, (2) HIP the casting to eliminate detrimental porosity and then (3) heat treat the casting to develop the appropriate mechanical properties.
An aluminum alloy casting alloy and heat treatment process that produces a cast product with properties equivalent to the aluminum alloy wrought alloys is desired to reduce material usage, energy usage and machining time and expense. BRIEF SUMMARY OF THE INVENTION
In accordance with principles of the present invention, a casting is made from an aluminum alloy containing, in weight percent:
Cu 5.00 - 6.75;
Mg 0.05 - 0.50;
Mn 0.05 - 0.65;
Ti 0.05 - 0.40;
Ag 0.00 - 0.40;
Cr 0.00 - 0.20;
V 0.00 - 0.40;
Zr 0.00 - 0.30;
Fe <0.15;
Si <0.15;
Ni <0.05;
Zn <0.05; impurities <0.05 each;
<0.25 total; and
Al balance.
The aluminum alloy casting is solution heat treated, then hot isostatically pressed, then solution heat treated again. This process produces a cast product having a multitude of second phase particles, and in particular a cast product in which an interdendritic network of second phase particles is eliminated.
More specifically, the aluminum alloy casting is solution heat treated at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 980 - 10050F (527 - 5410C) for 16 - 120 hours followed by quenching in water, hot isostatically pressed (HIP) at 950 - 9750F (510 - 5240C) and 15,000 ± 500 psi (103 ± 3.4 MPa) for 2 to 3 hours, solution heat treated at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 980 - 10050F (527 - 5410C) for 16 - 120 hours followed by quenching in water and aged. The casting may be either naturally aged at room temperature or artificially aged at 310 - 39O0F (154 - 1990C) for 1 to 96 hours.
The resulting aluminum alloy product in the naturally aged condition T4 has a minimum ultimate tensile strength of 57,100 psi (394 MPa), a minimum 0.2% offset yield strength of 38,500 psi (265 MPa), a minimum elongation of 6.2%, a minimum unnotched impact strength of 88 joules/cm2 and passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 30,000 psi (207 MPa).
The resulting aluminum alloy product in the artificially aged condition T6 has a minimum ultimate tensile strength of 66,100 psi (458 MPa), a minimum 0.2% offset yield strength of 47,800 psi (330 MPa) and a minimum elongation of 3.1 %.
The resulting aluminum alloy product in the artificially aged condition T7 has a minimum ultimate tensile strength of 48,600 psi (335 MPa), a minimum 0.2% offset yield strength of 43,900 psi (303 MPa), a minimum elongation of 1.0%, a minimum unnotched impact strength of 28 joules/cm2 and passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 40,000 psi (276 MPa).
The resulting aluminum alloy product in the artificially aged condition T61 has an average ultimate tensile strength of 69,660 psi (480 MPa), an average 0.2% offset yield strength of 59,390 psi (409 MPa), an average elongation of 6.3% and an average unnotched impact strength of 41 joules/cm2 and has similar ballistic performance to aluminum alloy wrought alloy 2519 in the T87 condition.
The aluminum alloy casting alloy of the present invention is desirable because it is weldable and retains the desired properties when heat treated after welding.
BRIEF DESCRIPTION OF THE DRAWING
In the drawing:
Fig. 1 is a picture of a seat frame cast with a prior art aluminum alloy;
Fig. 2 is a picture of a seat frame cast with an aluminum alloy according to principles of the present invention; Fig. 3 is a picture of a single plate of a known aluminum alloy wrought alloy and a single plate of the aluminum cast alloy according to the present invention after ballistic testing; and
Fig. 4 is a picture of a double plate of a known aluminum alloy wrought alloy and a double plate of the aluminum cast alloy according to the present invention after ballistic testing.
DETAILED DESCRIPTION OF THE INVENTION
Aluminum alloy casting alloys A201 and A206 were purchased as ingots from a supplier. The aluminum alloy casting alloy in the illustrated embodiment was produced using A206 ingot with addition of aluminum-copper, aluminum-manganese, aluminum- chromium, aluminum-vanadium, aluminum-zirconium master alloys and pure magnesium. Commercially available aluminum-titanium-boron and aluminum-titanium- carbon grain refiners were used. The chemical compositions of a plurality of aluminum alloy casting alloys produced are shown in Table 7. In Table 7, the columns represent a weight percentage of the indicated element and each row represents one mixture of the constituent elements, termed a heat and designated by a letter A through W.
Figure imgf000011_0001
Figure imgf000012_0001
Castability. The castability of the aluminum alloy casting alloys of the illustrated embodiment is determined by qualitatively comparing the fluidity and hot tearing tendency of A201 and A206 alloys to that of the illustrated embodiment. A complex seat frame casting that has thick and thin sections is poured from each alloy at various temperatures in chemically bonded sand molds that contain aluminum chills. Pictures of such seat frame castings are shown in Fig. 1 and Fig. 2. Aluminum alloy casting alloys A201 and A206 typically have very limited pouring temperature ranges since 1 ) the alloy must be poured at a temperature sufficiently high to completely fill the mold but 2) the alloy must be poured at as low a temperature as possible to prevent hot tearing.
For the seat frame casting, good castings could not be produced in aluminum alloy casting alloy A206. Good castings could be produced in aluminum alloy casting alloy A201 when poured in the temperature range 1350-13600F. Good castings could be produced in the aluminum alloy casting alloy of this embodiment (Heats A, B, D & E) when poured in the temperature range 1330-138O0F, a wider temperature range than with aluminum alloy casting alloy A201. Good seat frame castings could not be poured from Heat C. Thus, an aluminum alloy casting alloy should have a minimum copper content of about 5.20 wt% to produce good fluidity and good resistance to hot tearing. Seat frame castings were not poured from Heats F-W.
An example of an aluminum alloy casting alloy A206 casting with hot tears is shown in Fig. 1 and an example of a good casting poured in the aluminum alloy casting alloy of the illustrated embodiment is shown in Fig. 2. The larger pouring range of the aluminum alloy casting alloy of the illustrated embodiment is due to improved fluidity (ability to flow and fill a mold) and improved feeding (ability to supply metal during liquid contraction and the liquid-to-solid phase transformation). Good castability allows the production of complex castings at low scrap rates and, therefore, minimum cost.
Heat Treatment and Mechanical Properties. The aluminum alloy casting alloy of the illustrated embodiment is processed using a pre-HIP solution heat treatment. That is, instead of applying a HIP process to the cast product, that product is first heat treated. The mechanical properties of an aluminum alloy cast product are determined by soundness, chemistry and microstructure. Soundness is a measure of porosity, which is determined by the feeding characteristics of the aluminum alloy cast alloy. Soundness can be improved by hot isostatic pressing (HIP) the cast product. The chemistry of the aluminum alloy cast alloy ultimately determines what microstructural phases can be produced. The size, quantity and distribution of the microstructural phases and porosity determine the mechanical properties. The size, quantity and distribution of the microstructural phases are determined by heat treatment.
The aluminum alloy casting alloys of the illustrated embodiment produced less porosity than A201 but more porosity than A206 alloy. For the seat frame casting (Fig. 1 , Fig. 2), the average porosity for A201 alloy was 3.2%, for A206 alloy was 0.5% and for the aluminum alloy casting alloy of the illustrated embodiment was 1.5%.
The aluminum alloy casting alloy of the illustrated embodiment produced better mechanical properties compared to A201 alloy. Table 8 compares the mechanical properties of samples cut from seat frame castings produced from aluminum alloy casting alloy A201 and aluminum alloy casting alloy of heat A of the illustrated embodiment.
Table 8 - Average Mechanical Properties of Specimens Cut from Castings
Figure imgf000013_0001
Hot isostatic pressing (HIP'ing) is a well known, commercial process for reducing the porosity in castings. HIP'ing is typically performed before any other heat treatment. In the illustrated embodiment, however, solution heat treatment performed before HIP'ing produces improved mechanical properties, particularly improved resistance to stress corrosion cracking. However, solution heat treatment before HIP'ing is not a requirement to produce satisfactory properties using the aluminum alloy casting alloy of the illustrated embodiment.
Sections were cut from castings produced from the aluminum alloy casting alloy of the illustrated embodiment and heat treated in various ways to quantitatively determine the effect of HIP'ing and heat treatment cycle on mechanical properties.
The heat treatment cycles were: (1 ) a long pre-HIP solution heat treatment at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 990 - 9950F (532 - 5350C) for 68 - 96 hours followed by quenching in water, followed by HIP'ing at 950 - 9750F (510 - 5240C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours, followed by a post-HIP solution heat treatment (see below) and age; (2) a short pre-HIP solution heat treatment at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 990 - 9950F for 16-20 hours followed by quenching in water, followed by HIP'ing at 950 - 9750F (510 - 5240C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours, followed by a post-HIP solution heat treatment (see below) and age; and (3) HIP'ing at 950 - 9750F (510 - 5240C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours, followed by a post-HIP solution heat treatment (see below) and age (i.e. no pre-HIP solution heat treatment).
The T4 condition was produced by post-HIP solution heat treatment at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 990 - 9950F (532 - 5350C) for 16-20 hours followed by quenching in warm water at 120 - 18O0F (49 - 820C) and then naturally aging at room temperature for a minimum of seven days before testing. The T6 condition was produced by post-HIP solution heat treatment at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 990 - 9950F (532 - 5350C) for 16-20 hours followed by quenching in warm water at 120 - 18O0F (49 - 820C), naturally aging at room temperature for 8 - 24 hours and then artificially aging at 3250F (1630C) for 24 hours. Material heat treated to the T6 condition exhibited the best combination of strength and ductility: HIP'ing increased the tensile ductility by 60 to 101 %. The T61 condition was produced by post-HIP solution heat treatment at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 990 - 9950F (532 - 5350C) for 16-20 hours followed by quenching in warm water at 120 - 18O0F (49 - 820C), naturally aging at room temperature for 8 - 24 hours and then artificially aging at 3250F (1630C) for 36 hours. The T7 condition was produced by post-HIP solution heat treatment at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 990 - 9950F (532 - 5350C) for 16-20 hours followed by quenching in warm water at 120 - 18O0F (49 - 820C), naturally aging at room temperature for 8 - 24 hours and then artificially aging at 39O0F (1990C) for 24 hours.
The mechanical properties of samples cut from seat frame castings produced from the aluminum alloy casting alloy of the illustrated embodiment and heat treated in various ways are listed in Table 9.
Figure imgf000015_0001
Figure imgf000016_0001
Compared to aluminum alloy casting alloy A206, the aluminum alloy cast alloy of the illustrated embodiment has improved yield (design) strength in all heat treatment conditions. Also, the tensile ductility increased by 167% when subjected to the short solution heat treatment, followed by HIP'ing, followed by the T6 heat treatment. For comparison, sections from seat frame castings of each alloy were heat treated using identical processing conditions (e.g. solution heat treated, HIP'ed or not HIP'ed, then T6) and the results are listed in Table 10.
Table 10 - Average Mechanical Properties of Specimens Cut from Castings
Figure imgf000016_0002
To more fully determine the effect of chemistry, sections were cut from Y-block castings produced from different formulations of the aluminum alloy casting alloy of the illustrated embodiment, and heat treated using the same conditions. The heat treatment cycle was a long pre-HIP solution heat treatment at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 990 - 9950F (532 - 5350C) for 96 - 120 hours followed by quenching in water, HIP'ing at 950 - 9750F (510 - 5240C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours, followed by a post-HIP solution heat treatment and age. The T4 condition was produced by post-HIP solution heat treatment at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 990 - 9950F (532 - 5350C) for 16-20 hours followed by quenching in warm water at 120 - 18O0F (49 - 820C) and then naturally aging at room temperature for a minimum of seven days before testing.
The T6 condition was produced by post-HIP solution heat treatment at 950 -
96O0F (510 - 5160C) for 2 - 4 hours followed by 990 - 9950F (532 - 5350C) for 16-20 hours followed by quenching in warm water at 120 - 18O0F (49 - 820C), naturally aging at room temperature for 8 - 24 hours and then artificially aging at 3250F (1630C) for 24 hours.
The T7 condition was produced by post-HIP solution heat treatment at 950 -
96O0F (510 - 5160C) for 2 - 4 hours followed by 990 - 9950F (532 - 5350C) for 16-20 hours followed by quenching in warm water at 120 - 18O0F (49 - 820C), naturally aging at room temperature for 8 - 24 hours and then artificially aging at 39O0F (1990C) for 24 hours.
For an aluminum alloy casting alloy to have good mechanical properties, copper content should be limited to about 6.25 wt%, chromium content should be limited to about 0.20 wt% and magnesium content should be limited to about 0.50 wt%. The addition of silver was shown to significantly increase yield strength. The resulting data shows that ductility (e.g. tensile elongation) decreases as copper content increases, as chromium content increases and as magnesium content increases. Increasing manganese content or vanadium content was shown to decrease yield strength and increase ductility. Increasing zirconium content was shown to have an inconsistent effect on mechanical properties. The mechanical properties of samples cut from castings produced from the aluminum alloy casting alloy of the illustrated embodiment and heat treated in similar ways are displayed in Table 1 1.
Table 11 - Average Tensile Properties of Specimens Cut from Castings
Figure imgf000017_0001
Figure imgf000018_0001
Figure imgf000019_0001
The aluminum alloy casting alloy of the illustrated embodiment has good stress corrosion cracking properties that are enhanced when solution heat treated before HIP'ing. Aluminum alloy cast alloys and wrought alloys that contain copper typically have unacceptable stress corrosion cracking properties in the T6 condition but often have acceptable stress corrosion cracking properties in the T4 or T7 conditions. Samples from two heats (Heat B, Heat D) were given a variety of heat treatments and then subjected to the standard stress corrosion cracking test, ASTM G47-98 (2004). The heat subjected to long solution heat treatment prior to HIP'ing (Heat D) exhibited significantly improved resistance to stress corrosion cracking (almost produced "acceptable" results) in the T6 condition. The stress corrosion cracking performance, as determined by ASTM G47-98 (2004), for the two different heat treatment processes and aluminum alloy casting alloys of the illustrated embodiment are displayed in Table 12.
Table 12 - Stress Corrosion Crackin Performance, ASTM G47
Figure imgf000020_0001
* failed on the last day of the test
The aluminum alloy casting alloy of the illustrated embodiment is weldable. Aluminum alloy casting alloys are not normally welded so little or no published data exists for comparison purposes. However, aluminum alloy wrought alloys are often welded and the aluminum alloy casting alloy of the illustrated embodiment compared favorably to published data for material tested in the heat treated then welded condition. The welder had no prior experience welding the aluminum alloy casting alloy of the illustrated embodiment and very little experience with aluminum alloy 2319 welding wire. The aluminum alloy casting alloy of the illustrated embodiment can be heat treated after welding to develop improved properties. Further, solution treatment after welding but prior to HIP'ing results in significantly improved yield strength. Solution treatment after welding but prior to HIP'ing resulted in an 85% increase in yield strength in the T4 condition and a 27% increase in yield strength in the T6 condition. A comparison of the tensile properties after welding of aluminum alloy wrought alloy 2219, aluminum alloy wrought alloy 2519 (from published data) and the aluminum alloy casting alloy of the illustrated embodiment is displayed in Table 13 and the tensile properties of the aluminum alloy casting alloy of the illustrated embodiment after welding followed by heat treatment is displayed in Table 14.
Table 13 - Average Tensile Properties after Welding
Figure imgf000021_0001
* from U.S. Patent No. 4,610,733
Table 14 - Average Tensile Properties after Welding Followed by Heat Treatment
Figure imgf000021_0002
The aluminum alloy casting alloy of the illustrated embodiment in the T61 condition has ballistic properties similar to aluminum alloy wrought alloy 2519 in the T87 condition. Samples of the aluminum alloy casting alloy of the illustrated embodiment in the T61 condition and aluminum alloy wrought alloy 2519 in the T87 condition were machined to the same size and dimensions and shot at with 0.223 caliber standard rounds at a distance of approximately 50 meters (150 feet). Single plates, 0.5" thick, of the aluminum alloy casting alloy of the illustrated embodiment in the T61 condition and the aluminum alloy wrought alloy 2519 in the T87 condition were completely penetrated, as illustrated in Fig. 3. Fig. 3a is a picture of a single plate of the aluminum alloy casting alloy of the illustrated embodiment after the ballistic testing described above, and Fig. 3b is a picture of a single plate of the aluminum alloy wrought alloy 2519 after the ballistic testing described above.
Double plates of the aluminum alloy casting alloy of the illustrated embodiment in the T61 condition and the aluminum alloy wrought alloy 2519 in the T87 condition were not penetrated after the same ballistic testing described above, as illustrated in Fig. 4. Fig. 4a is a picture of a double plate of the aluminum alloy casting alloy of the illustrated embodiment after the ballistic testing described above, and Fig. 4b is a picture of a double plate of the aluminum alloy wrought alloy 2519 after the ballistic testing described above.
Articles Made From The Aluminum Alloy Casting Alloy Of The Illustrated
Embodiment
The aluminum alloy casting alloy of the present illustrated embodiment is ideally suited for articles requiring high strength, high toughness, resistance to penetration by ballistic objects, resistance to stress corrosion cracking and light in weight. These articles are commonly used in racing, aerospace and military (land, sea and air) vehicles. Specifically, a seat frame for a military vehicle, (Fig. 1 and Fig. 2), was used as a test casting for developing the aluminum alloy casting alloy of the illustrated embodiment. Light-weight armor, a turret rotor, a turret housing and hatches for a military weapon system, bolts and welding wire are currently being developed and evaluated. The aluminum alloy casting alloy of the illustrated embodiment could be a replacement for aluminum alloy casting alloy A201 , which is currently used for the steering deflector on the AAAV amphibious military vehicle. Of course, the applications for the aluminum alloy casting alloy of the illustrated embodiment are not limited to only those articles discussed above.
Preferred Embodiments
The composition for an aluminum alloy casting alloy according to principles of the present invention, in weight percent, is as follows:
Cu 5.00 - 6.75
Mg 0.05 - 0.50
Mn 0.05 - 0.65
Ti 0.05 - 0.40
Ag 0.00 - 0.40
Cr 0.00 - 0.20
Ti 0.05 - 0.40
V 0.00 - 0.40
Zr 0.00 - 0.30
Fe <0.15
Si <0.15
Ni <0.05 Zn <0.05 impurities <0.05 each
<0.25 total
Al balance
wherein the aluminum alloy casting alloy is grain refined using a 0.04 - 2.00 weight % addition of aluminum-5 weight % titanium-1 weight % boron and a 0.07 - 2.00 weight % addition of aluminum-3 weight % titanium-0.15 weight % carbon containing grain refiner.
An optimum composition for the aluminum alloy casting alloy, in weight percent, is as follows:
Cu 5.00 - 6.25
Mg 0.20 - 0.50
Mn 0.20 - 0.40
Ti 0.05 - 0.40
Ag 0.00 - 0.40
Cr 0.00 - 0.20
V 0.05 - 0.25
Zr 0.05 - 0.25
Fe <0.10
Si <0.10
Ni <0.05
Zn <0.05 impurities <0.05 each
<0.25 total
Al balance
wherein the aluminum alloy casting alloy is grain refined using a 0.04 - 0.08 weight % addition of aluminum-5 weight % titanium-1 weight % boron and a 0.07 - 0.10 weight % addition of aluminum-3 weight % titanium-0.15 weight % carbon containing grain refiner.
A heat treatment for an aluminum alloy casting alloy according to principles of the present invention is as follows: 1. Solution heat treat at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 980
- 10050F (527 - 5410C) for 16 - 120 hours followed by quenching in water (this step is optional)
2. Hot isostatic pressing (HIP'ing) at 950 - 9750F (510 - 5240C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours
3. Solution heat treat at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 980
- 10050F (527 - 5410C) for 16 - 120 hours followed by quenching in water
4. Naturally age at room temperature or artificially age at 310 - 3900F (154 - 1990C) for 1 to 96 hours
The optimum heat treatment for the aluminum alloy casting alloy is as follows:
1. Solution heat treat at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 990
- 9950F (532 - 5350C) for 68 - 120 hours followed by quenching in water
2. Hot isostatic pressing (HIP'ing) at 950 - 9750F (510 - 5240C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours
3. Solution heat treat at 990 - 9950F (532 - 5350C) for 16 - 24 hours followed by quenching in water
4. T4: Naturally age at room temperature;
T6: Artificially age at 3250F (1630C) for 24 hours; T61 : Artificially age at 325-3400F (163 - 1710C) for 24 - 36 hours;
T7: Artificially age at 39O0F (1990C) for 24 hours.

Claims

What is claimed is:
1. An aluminum alloy cast product consisting essentially of:
Cu 5.00 - 6.75 weight%, Mg 0.05 - 0.50 weight%,
Mn 0.05 - 0.65 weight%,
Ti 0.05 - 0.40 weight%,
Ag 0.00 - 0.40 weight%,
Cr 0.00 - 0.20 weight%, V 0.00 - 0.40 weight%,
Zr 0.00 - 0.30 weight%,
Fe <0.15 weight%,
Si <0.15 weight%,
Ni <0.05 weight%, Zn <0.05 weight%, impurities <0.05 each weight%, <0.25 total weight%,
Al balance
wherein an aluminum alloy cast product contains an interdendritic network of second phase particles in the as-cast condition.
2. The cast product of claim 1 wherein the interdendritic network of second phase particles is eliminated by solution heat treatment prior to hot isostatic pressing.
3. The cast product of claim 1 wherein the cast product after heat treatment exhibits relatively high strength, high toughness, high resistance to penetration from ballistic objects, high resistance to stress corrosion cracking and low weight.
4. The cast product of claim 1 wherein the cast product is weldable.
5. A method for producing a cast product of an aluminum alloy, comprising the steps of: melting the following to form a cast alloy of: Cu 5.00 - 6.75 weight%,
Mg 0.05 - 0.50 weight%,
Mn 0.05 - 0.65 weight%, Ti 0.05 - 0.40 weight%,
Ag 0.00 - 0.40 weight%,
Cr 0.00 - 0.20 weight%,
V 0.00 - 0.40 weight%, Zr 0.00 - 0.30 weight%, Fe <0.15 weight%,
Si <0.15 weight%,
Ni <0.05 weight%,
Zn <0.05 weight%, impurities <0.05 each weight%, <0.25 total weight%, and
Al balance; casting a product from the melted cast alloy; heat treating the cast product to eliminate an interdendritic network of second phase particles; hot isostatically pressing the heat treated cast product to eliminate porosity; and heat treating the hot isostatically pressed cast product to obtain desired mechanical and physical properties.
6. A product made by the process of claim 5.
7. A cast product of an aluminum alloy consisting essentially of, in weight percent:
Cu 5.00 - 6.75 weight%,
Mg 0.05 - 0.50 weight%,
Mn 0.05 - 0.65 weight%, Ti 0.05 - 0.40 weight%,
Ag 0.00 - 0.40 weight%,
Cr 0.00 - 0.20 weight%,
V 0.00 - 0.40 weight%, Zr 0.00 - 0.30 weight%, Fe <0.15 weight%,
Si <0.15 weight%,
Ni <0.05 weight%,
Zn <0.05 weight%, impurities <0.05 each weight%, <0.25 total weight%, Al balance
wherein the aluminum alloy casting alloy is grain refined using aluminum- titanium-boron and/or aluminum-titanium-carbon containing grain refiner; wherein the aluminum alloy casting alloy is cast in a sand, ceramic or metal mold to form the cast product; wherein the aluminum alloy cast product is hot isostatically pressed (HIP'ed) at 950 - 9750F (510 - 5240C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours, solution treated at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 980 - 10050F (527 - 5410C) for 16 - 120 hours followed by quenching in water and naturally aged at room temperature or artificially aged at 310 - 39O0F (154 - 1990C) for 1 to 96 hours; whereby the aluminum alloy product in the naturally aged condition T4 has a minimum ultimate tensile strength of 57,100 psi (394 MPa), a minimum 0.2% offset yield strength of 38,500 psi (265 MPa), a minimum elongation of 6.2%, a minimum unnotched impact strength of 88 joules/cm2 and passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 30,000 psi (207 MPa); whereby the aluminum alloy product in the artificially aged condition T6 has a minimum ultimate tensile strength of 61 ,500 psi (424 MPa), a minimum 0.2% offset yield strength of 47,800 psi (330 MPa) and a minimum elongation of 3.1 %; whereby the aluminum alloy product in the artificially aged condition T7 has a minimum ultimate tensile strength of 48,600 psi (335 MPa), a minimum 0.2% offset yield strength of 43,900 psi (303 MPa), a minimum elongation of 1.0%, a minimum unnotched impact strength of 28 joules/cm2 and passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 40,000 psi (276 MPa); whereby the aluminum alloy product in the artificially aged condition T61 has an average ultimate tensile strength of 69,660 psi (480 MPa), an average 0.2% offset yield strength of 59,390 psi (409 MPa), an average elongation of 6.3% an average unnotched impact strength of 41 joules/cm2 and has similar ballistic performance to aluminum alloy wrought alloy 2519 in the T87 condition.
8. An aluminum alloy cast product according to claim 7, wherein, before the aluminum alloy cast product is hot isostatically pressed, it is solution treated at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 980 - 10050F (527 - 5410C) for 16 - 120 hours followed by quenching in water.
9. An aluminum alloy cast product according to claim 7, wherein the sand cast aluminum alloy product is a seat frame of a military vehicle.
10. An aluminum alloy cast product according to claim 7, wherein the sand cast aluminum alloy product is a turret rotor of a military weapon system.
1 1. An aluminum alloy cast product according to claim 7, wherein the sand cast aluminum alloy product is a hatch of a military weapon system.
12. An aluminum alloy cast product according to claim 7, wherein the sand cast aluminum alloy product is ballistic armor.
13. An aluminum alloy cast product according to claim 7, wherein the aluminum alloy product is welding wire.
14. An aluminum alloy cast product consisting essentially of:
Cu 5.00 - 6.25 weight%,
Mg 0.20 - 0.50 weight%,
Mn 0.20 - 0.65 weight%,
Ti 0.05 - 0.40 weight%,
Ag 0.00 - 0.40 weight%,
Cr 0.00 - 0.20 weight%,
V 0.05 - 0.25 weight%,
Zr 0.05 - 0.25 weight%,
Fe <0.15 weight%,
Si <0.15 weight%,
Ni <0.05 weight%,
Zn <0.05 weight%, impurities <0.05 each weight%, <0.25 total weight%, Al balance
wherein the aluminum alloy casting alloy is grain refined using aluminum- titanium-boron and/or aluminum-titanium-carbon containing grain refiner; wherein the aluminum alloy casting alloy is cast in a sand mold, wherein the aluminum alloy cast product is hot isostatically pressed (HIP'ed) at 950 - 9750F (510 - 5240C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours, solution treated at 980 - 10050F (527 - 5410C) for 16 - 120 hours followed by quenching in water and naturally aged at room temperature or artificially aged at 310 - 39O0F (154 - 1990C) for 12 to 96 hours.
15. An aluminum alloy cast product according to claim 14, wherein the sand cast aluminum alloy product is a seat frame of a military vehicle.
16. An aluminum alloy cast product according to claim 14, wherein the sand cast aluminum alloy product is a turret rotor of a military weapon system.
17. An aluminum alloy cast product according to claim 14, wherein the sand cast aluminum alloy product is a hatch of a military weapon system.
18. An aluminum alloy cast product according to claim 14, wherein the sand cast aluminum alloy product is ballistic armor.
19. An aluminum alloy cast product according to claim 14, wherein the aluminum alloy product is welding wire.
20. An aluminum alloy cast product consisting essentially of:
Cu 5.00 - 6.25 weight%, Mg 0.20 - 0.50 weight%,
Mn 0.20 - 0.65 weight%, Ti 0.05 - 0.40 weight%,
Ag 0.00 - 0.40 weight%,
Cr 0.00 - 0.20 weight%,
V 0.05 - 0.25 weight%, Zr 0.05 - 0.25 weight%,
Fe <0.15 weight%,
Si <0.15 weight%,
Ni <0.05 weight%,
Zn <0.05 weight%, impurities <0.05 each weight%,
<0.25 total weight%,
Al balance
wherein the aluminum alloy casting alloy is grain refined using aluminum- titanium-boron and/or aluminum-titanium-carbon containing grain refiner; wherein the aluminum alloy casting alloy is cast in a sand mold; wherein the aluminum alloy product is solution treated at 950 - 96O0F (510 — 5160C) for 2 - 4 hours followed by 980 - 10050F (527 - 5410C) for 16 - 120 hours followed by quenching in water, hot isostatically pressed (HIP'ed) at 950 - 9750F (510 - 5240C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours, solution treated at 980 - 10050F (527 - 5410C) for 16 - 120 hours followed by quenching in water and naturally aged at room temperature or artificially aged at 310 - 39O0F (154 - 1990C) for 12 to 96 hours; whereby the aluminum alloy product in the naturally aged condition T4 has a minimum ultimate tensile strength of 61 ,000 psi (420 MPa), a minimum 0.2% offset yield strength of 38,500 psi (265 MPa), a minimum elongation of 10.9%, a minimum unnotched impact strength of 88 joules/cm2 and passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 30,000 psi (207 MPa); whereby the aluminum alloy product in the artificially aged condition T6 has a minimum ultimate tensile strength of 66,600 psi (459 MPa), a minimum 0.2% offset yield strength of 47,800 psi (330 MPa), a minimum elongation of 4.9%, a minimum unnotched impact strength of 40 joules/cm2 and nearly passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 40,000 psi (276 MPa); whereby the aluminum alloy product in the artificially aged condition T61 has an average ultimate tensile strength of 69,660 psi (480 MPa), an average 0.2% offset yield strength of 59,390 psi (409 MPa), an average elongation of 6.3%, an average unnotched impact strength of 41 joules/cm2 and similar ballistic performance to aluminum alloy wrought alloy 2519 in the T87 condition; whereby the aluminum alloy product in the artificially aged condition T7 has a minimum ultimate tensile strength of 59,700 psi (412 MPa), a minimum 0.2% offset yield strength of 43,900 psi (303 MPa), a minimum elongation of 3.9%, a minimum unnotched impact strength of 28 joules/cm2 and passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 40,000 psi (276 MPa).
21. An aluminum alloy cast product according to claim 20, wherein the sand cast aluminum alloy product is a seat frame of a military vehicle.
22. An aluminum alloy cast product according to claim 20, wherein the sand cast aluminum alloy product is a turret rotor of a military weapon system.
23. An aluminum alloy cast product according to claim 20, wherein the sand cast aluminum alloy product is a hatch of a military weapon system.
24. An aluminum alloy cast product according to claim 20, wherein the sand cast aluminum alloy product is ballistic armor.
25. An aluminum alloy cast product according to claim 20, wherein the aluminum alloy product is welding wire.
26. An aluminum alloy casting alloy consisting essentially of:
Cu 5.00 - 6.25 weight%,
Mg 0.20 - 0.50 weight%,
Mn 0.20 - 0.65 weight%,
Ti 0.05 - 0.40 weight%,
Ag <0.40 weight%,
Cr <0.20 weight%,
V <0.05 weight%, Zr <0.10 weιght%,
Fe <0.15 weight%,
Si <0.15 weight%,
Ni <0.05 weight%,
Zn <0.05 weight%, impurities <0.05 each weight%,
<0.25 total weight%,
Al balance
wherein the aluminum alloy casting alloy is grain refined using aluminum- titanium-boron and/or aluminum-titanium-carbon containing grain refiner; wherein the aluminum alloy casting alloy is cast in a sand mold to form a cast product; and wherein the aluminum alloy cast product is solution treated at 950 - 96O0F (510 - 5160C) for 2 - 4 hours followed by 980 - 10050F (527 - 5410C) for 16 - 120 hours followed by quenching in water, hot isostatically pressed (HIP'ed) at 950 - 9750F (510 — 5240C), 15,000 +/- 500 psi (103 +/- 3.4 MPa) for 2 to 3 hours, solution treated at 980 - 10050F (527 - 5410C) for 16 - 120 hours followed by quenching in water and naturally aged at room temperature or artificially aged at 310 - 39O0F (154 - 1990C) for 12 to 96 hours; whereby the aluminum alloy cast product in the naturally aged condition T4 has a minimum ultimate tensile strength of 60,800 psi (419 MPa), a minimum 0.2% offset yield strength of 40,800 psi (287 MPa) and a minimum elongation of 12.4%; and whereby the aluminum alloy product in the artificially aged condition T6 has a minimum ultimate tensile strength of 67,300 psi (464 MPa), a minimum 0.2% offset yield strength of 52,600 psi (362 MPa) and a minimum elongation of 6.5%;
27. An aluminum alloy cast product according to claim 26, wherein the sand cast aluminum alloy product is a seat frame of a military vehicle.
28. An aluminum alloy cast product according to claim 26, wherein the sand cast aluminum alloy product is a turret rotor of a military weapon system.
29. An aluminum alloy cast product according to claim 26, wherein the sand cast aluminum alloy product is a hatch of a military weapon system.
30. An aluminum alloy cast product according to claim 26, wherein the sand cast aluminum alloy product is ballistic armor.
31. An aluminum alloy cast product according to claim 26, wherein the aluminum alloy product is welding wire.
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CN105177471A (en) * 2015-06-29 2015-12-23 含山县裕源金属制品有限公司 Damping wear-resisting composite aluminum alloy automobile part mixed with tetrapod-shaped zinc oxide whiskers and casting technology of damping wear-resisting composite aluminum alloy automobile part
CN112281034A (en) * 2020-10-16 2021-01-29 中国航发北京航空材料研究院 Cast aluminum alloy and preparation method thereof

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