CN106756363B - A kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy and preparation method thereof - Google Patents
A kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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Abstract
The present invention provides a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy and preparation method thereof, belongs to lightweight metal material technical field.The composition of the casting magnesium alloy and the mass percent of each component are as follows: Al:7.0~11.5wt.%, Zn:0.5~2.0wt.%, Mn:0.3~0.4wt.%, RE:0.2~2.5wt.%, Yb:0.1~3.3wt.%, Sm:0.1~5.8wt.%, Sr:0.1~2.0wt.%, surplus is Mg and inevitable impurity element, and RE is mischmetal.The present invention also provides a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy preparation methods.Test indicate that: under conditions of application stress 50MPa, 150 DEG C of test temperature, magnesium alloy 100h secondary creep rates of the invention are 1.81 × 10‑9s‑1, 100h creep strain is 0.18%；By 35 DEG C, 5%NaCl neutral salt spray test 100 hours, corrosion rate 0.055mg/cm2day。
Description
Technical field
The invention belongs to lightweight metal material technical fields, and in particular to a kind of corrosion-resistant, high temperature creep-resisting die casting magnesium conjunction
Gold and preparation method thereof.
Background technique
For magnesium alloy as structural material most light at present, density is 1.75~1.90g/cm3, only the 1/4 of steel, aluminium closes
The 2/3 of gold.Compared to other metal materials, magnesium alloy has high specific strength, specific stiffness, good machinability, electromagnetism
Protective characteristic, damping capacity and thermal conductivity, and easily recycle.In the case where current iron ore, titanium ore and bauxite resource are nervous, open
It sends out and has become inexorable trend using magnesium as alternative materials.Therefore, magnesium alloy is known as that " 21 century is commercial environmentally protective and raw
State structural metallic materials " is just widely used in fields such as auto industry, telecommunications industry and aerospaces.
Currently, most in industrial production of magnesium alloy are cast magnesium alloys, especially diecast magnesium alloy.Quotient at present
Diecast magnesium alloy mainly has magnalium system (magnesium-aluminum-zinc), magnesium manganese systems (magnesium-aluminium-manganese), magnesium silicon systems (magnesium-aluminium-silicon) and magnesium dilute
The soil series (magnesium-aluminium-rare-earth).Wherein magnalium system and magnesium manganese systems industrial application are than wide, but the alloy of the two series lacks
Good Properties of High Temperature Creep can only be limited in the structural member that service temperature is lower than 120 DEG C.But the dynamical system work of automobile
150 DEG C are generally greater than as temperature, therefore develop high temperature creep-resisting diecast magnesium alloy to become urgent problem to be solved.
The reason of Magnesium-aluminum alloys Properties of High Temperature Creep difference is commonly considered as the eutectic phase Mg there are low melting point17Al12
(473 DEG C of molten point), this is mutually easy to soften and be roughened at 120 DEG C or more.Currently known raising Magnesium-aluminum alloys high temperature creep-resisting
The approach of performance is exactly alloying, improves its Properties of High Temperature Creep by introducing rare earth, alkaline earth element.Rare earth and alkaline earth member
On the one hand the addition of element can form dystectic second phase, on the other hand can reduce Mg17Al12, so that it is resistant to high temperatures compacted to improve its
It is denaturalized energy.Ytterbium is as heavy rare earth element, and diffusion rate is relatively low in magnesium, can be good at being solid-solubilized in magnesium-based matter, improves magnesium
The corrosion resistance of alloy.In addition, Yb and Mg can form the second phase with high-melting-point (fusing point is 718 DEG C) of good thermal stability
Mg2Yb, to improve its heat resistance.Samarium element has bigger solid solubility in magnesium, and can be formed with magnesium hot steady
Qualitative good Mg41Sm5And Mg3The second phase of Sm.Therefore, samarium can effectively improve the heat resistance of magnesium alloy.Existing research
Show that two kinds of rare earth elements not of the same clan (Ce race and Y race) are added in magnesium can preferably play strengthening effect.And belong to not
Magnesium alloy, which is added, not only simultaneously in two or more rare earth elements of the same clan can reduce solid solubility each other in magnesium matrix, improve
Precipitation phase density；It can also dissolve in each other in the precipitated phase of another rare earth element and further increase alloy comprehensive performance.
When the additive amount of mixed rare-earth elements is higher than 1%, low-alloyed corrosion resistance and room-temperature mechanical property can drop, therefore in magnalium
It is that the content of mischmetal in alloy should be limited within 1%.But a small amount of mischmetal is to its high temperature high temperature creep resistance
It can influence little.Therefore, introducing alkaline-earth metal becomes a kind of effective means, and micro strontium element can not only improve Magnesium-aluminum alloys
Properties of High Temperature Creep, and the strong tendency of hot tearing that alloy can also be reduced.
Summary of the invention
The purpose of the present invention is to solve it is existing casting corrosion resistance of magnesium alloy can and Properties of High Temperature Creep difference ask
Topic, and a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy is provided and preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions.
Present invention firstly provides a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy, the quality hundred of composition and each component
Divide ratio as follows:
Al:7.0~11.5wt.%,
Zn:0.5~2.0wt.%,
Mn:0.3~0.4wt.%,
RE:0.2~2.5wt.%,
Yb:0.1~3.3wt.%,
Sm:0.1~5.8wt.%,
Sr:0.1~2.0wt.%,
Surplus is Mg and inevitable impurity element, and RE is mischmetal.
Preferably, described one kind is corrosion-resistant, high temperature creep-resisting diecast magnesium alloy, and the mass percent of each component is as follows:
Al:9.0wt.%,
Zn:0.8wt.%,
Mn:0.35wt.%,
RE:0.8wt.%,
Yb:1.5wt.%,
Sm:3.0wt.%,
Sr:0.8wt.%,
Surplus is Mg and inevitable impurity element, and RE is mischmetal.
The present invention also provides a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy preparation methods, comprising the following steps:
Step 1: magnesium source, silicon source, zinc source, manganese source, mischmetal source, ytterbium source, samarium source and barium source are carried out melting, obtain
Uniform aluminium alloy；
Step 2: the aluminium alloy that step 1 is obtained, which pours into cold-chamber die casting machine, carries out die casting, a kind of corrosion-resistant, anti-height is obtained
Warm creep diecast magnesium alloy.
Preferably, magnesium source is pure magnesium ingot in the step 1, and silicon source is fine aluminium ingot, and zinc source is pure zinc ingot.
Preferably, manganese source is the magnesium manganese intermediate alloy containing 2% manganese in the step one, and mischmetal source is containing 20%
The magnesium rare earth intermediate alloy of mischmetal, ytterbium source are in the magnesium samarium containing 20% samarium for the magnesium ytterbium intermediate alloy containing 15% ytterbium, samarium source
Between alloy, barium source be the magnesium strontium intermediate alloy containing 15% strontium.
Preferably, the mischmetal is cerium-rich mischmetal, specific ingredient are as follows: Ce:65%, La:34.6%,
Pr:0.10%, Nd:0.18%, Fe:0.07%, Si:0.03%, Cu:0.01%, Ni:0.01%.
Preferably, smelting temperature is 730~760 DEG C in the step one, smelting time 10-15min.
Preferably, the step 1, when smelting temperature reaches 750 DEG C, is passed through argon gas dehydrogenation in fusion process.
Preferably, after argon gas dehydrogenation being passed through in step 1, No. 6 flux is added and are refined, it is then allowed to stand 40~
60min。
Preferably, cast temperature is 695~720 DEG C in the step 2, and the die casting time is 20~40s.
Beneficial effects of the present invention
Present invention firstly provides a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy, the quality hundred of composition and each component
Divide ratio as follows: Al:7.0~11.5wt.%, Zn:0.5~2.0wt.%, Mn:0.3~0.4wt.%, RE:0.2~
2.5wt.%, Yb:0.1~3.3wt.%, Sm:0.1~5.8wt.%, Sr:0.1~2.0wt.%, surplus are Mg and can not keep away
The impurity element exempted from, RE are mischmetal.It compares with the prior art, mischmetal is added in alloy of the invention and strontium introduces
The Al of good thermal stability8Mn4RE phase and Al4Sr phase, reduces Mg17Al12The amount of phase；Ytterbium diffusion rate in magnesium is very low,
It can be good at being solid-solubilized in magnesium-based matter, improve the corrosion resistance of magnesium alloy；Yb and Mg can form good thermal stability simultaneously
The second phase Mg with high-melting-point (fusing point is 718 DEG C)2Yb, to improve its heat resistance；Samarium element has in magnesium to be compared
Big solid solubility, and the Mg of good thermal stability can be formed with magnesium41Sm5And Mg3The second phase of Sm, therefore, samarium can be effective
Raising magnesium alloy heat resistance；In addition, Sm, Yb and Al can also form the intermetallic compound Al-Sm of good thermal stability
Phase and Al2Yb phase；The amount of Al is consumed, Mg is inhibited17Al12The formation of phase, to improve the high temperature creep resistance of AZ91 alloy
Energy.
The present invention also provides a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy preparation method, the preparation method is simple,
Raw material is easy to get, and the magnesium alloy being prepared has good corrosion resistance and Properties of High Temperature Creep.Test indicate that: it is applying
Add stress 50MPa, under conditions of 150 DEG C of test temperature, magnesium alloy 100h secondary creep rates of the invention are 1.81 × 10-9s-1, 100h creep strain is 0.18%；By 35 DEG C, 5%NaCl neutral salt spray test 100 hours, corrosion rate 0.055mg/
cm2day。
Detailed description of the invention
Fig. 1 is corrosion-resistant, high temperature creep-resisting diecast magnesium alloy as-cast metallographic structure prepared by the embodiment of the present invention 2.
Fig. 2 be the embodiment of the present invention 2 prepare corrosion-resistant, high temperature creep-resisting diecast magnesium alloy as cast condition Electronic Speculum tissue and
Al4Sr phase EDAX results.
Fig. 3 is corrosion-resistant, high temperature creep-resisting diecast magnesium alloy in 1-3 of the embodiment of the present invention and comparative example at 35 DEG C, 5%
NaCl neutral salt spray test 100 hours corrosion rate figures.
Specific embodiment
Present invention firstly provides a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy, the quality hundred of composition and each component
Divide ratio as follows:
Al:7.0~11.5wt.%, Zn:0.5~2.0wt.%, Mn:0.3~0.4wt.%, RE:0.2~2.5wt.%,
Yb:0.1~3.3wt.%, Sm:0.1~5.8wt.%, Sr:0.1~2.0wt.%, surplus are Mg and inevitable impurity member
Element, RE are mischmetal.Preferably, Al:9.0wt.%, Zn:0.8wt.%, Mn:0.35wt.%, RE:0.8wt.%, Yb:
1.5wt.%, Sm:3.0wt.%, Sr:0.8wt.%.
According to the present invention, the inevitable impurity element includes: Fe, Cu, Si, Ni, each impurity element quality percentage
Than are as follows: Fe≤0.005%, Cu≤0.0005%, Si≤0.005%, Ni≤0.0005%.
The present invention also provides a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy preparation methods, comprising the following steps:
Step 1: magnesium source, silicon source, zinc source, manganese source, mischmetal source, ytterbium source, samarium source and barium source are carried out melting, obtain
Uniform aluminium alloy；
Step 2: the aluminium alloy that step 1 is obtained, which pours into cold-chamber die casting machine, carries out die casting, a kind of corrosion-resistant, anti-height is obtained
Warm creep diecast magnesium alloy
According to the present invention, magnesium source, zinc source, manganese source, mischmetal source, ytterbium source, samarium source and barium source are first subjected to melting, it is described
Smelting temperature be preferably 730~760 DEG C, smelting time is preferably 10-15min, obtains uniform aluminium alloy；It is preferred that working as melt
When temperature is 750 DEG C, it is passed through argon gas dehydrogenation, draft speed is appropriate, not make magnesium liquid occur to splash to ventilate the duration for principle
Preferably 20~30s after ventilation, is added No. 6 flux and is refined, and after sufficiently incorporating melt to No. 6 flux, stands 40
~60min, obtains aluminium alloy；
The source of the above-mentioned raw materials is not particularly limited, and is source known in magnesium-rare earth preparation field, and one
As magnesium source, silicon source and zinc source be respectively pure magnesium ingot, fine aluminium ingot, pure zinc ingot, manganese source is the magnesium manganese intermediate alloy containing 2% manganese；Ytterbium source
It is the magnesium samarium intermediate alloy containing 20% samarium for the magnesium ytterbium intermediate alloy containing 15% ytterbium, samarium source, barium source is in the magnesium strontium containing 15% strontium
Between alloy；Mischmetal source is the magnesium rare earth intermediate alloy containing 20% mischmetal, and the mischmetal is preferably that rich cerium is mixed
Rare earth is closed, specific ingredient are as follows: Ce:65%, La:34.6%, Pr:0.10%, Nd:0.18%, Fe:0.07%, Si:
0.03%, Cu:0.01%, Ni:0.01%.It should be noted that those skilled in the art can match according to the component of alloy
Than raw material, the mass percent of magnesium by magnesium manganese intermediate alloy, magnesium ytterbium intermediate alloy, magnesium samarium intermediate alloy, magnesium strontium intermediate alloy and
Magnesium in magnesium rare earth intermediate alloy codetermines.
According to the present invention, No. 6 flux are product well known to those skilled in the art, can be commercially available,
Main component (mass percent) are as follows: KCl:54-56%, BaCl2: 14-16%, NaCl:1.5-2.5%, CaCl2: 27-29%.
No. 6 flux additional amounts are the 1%~1.5% of each total mass of raw material；The adding manner of No. 6 flux is not special
Limitation, it is preferred to use mode stirring while adding.
According to the present invention, aluminium alloy obtained above is poured into cold-chamber die casting machine and carries out die casting, obtained a kind of corrosion-resistant, anti-
High-temerature creep diecast magnesium alloy；The temperature of the die casting is preferably 695~720 DEG C, and the die casting time is preferably 20~40s, injection
Speed is preferably 2~4m/s.
The present invention is by introducing cheap cerium-rich mischmetal, the ytterbium with larger solid solubility and samarium, micro alkaline earth gold
Belong to strontium, to form a series of the second phases with high-melting-point, good thermal stability, improves the heat resistance of alloy.In addition, rare earth
There is thinning microstructure, purification melt in magnesium alloy, reduce impurity concentration, inhibit micro- galvanic corrosion, generate more protective
Corrosion products film improves alloy surface membrane stability, so rare earth element can be improved the corrosion resistance of magnesium alloy.Alkaline earth gold
Belong to the addition of Sr, Al can be formed with Al4Sr phase, which can be such that the corrosion potential of alloy shuffles, to make the anti-corrosion of alloy
Property improve.
In order to further appreciate that the present invention, the present invention is further described With reference to embodiment.
Embodiment 1
A kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy, is the Al made of the component of following mass percent:
8.5wt.%；Zn:0.5wt.%；Mn:0.35wt.%；RE:0.4wt.%；Yb:1.0wt.%；Sm:2.0wt.%；Sr:
0.2wt.%；Surplus is pure magnesium and inevitable impurity.
A kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy preparation process, steps are as follows:
1) by pure magnesium ingot, fine aluminium ingot, pure zinc ingot, the magnesium manganese intermediate alloy containing 2% manganese, containing the magnesium rare earth of 20% mischmetal
Intermediate alloy, the magnesium ytterbium intermediate alloy containing 15% ytterbium, the magnesium samarium intermediate alloy containing 20% samarium, the magnesium strontium intermediate alloy containing 15% strontium
Melting is carried out at 730 DEG C, stirring obtains uniform aluminium alloy in 10 minutes；
2) so that furnace temperature is risen to 750 DEG C, be passed through argon gas dehydrogenation, the ventilation duration is 20s；
3) after ventilating, 1% No. 6 solvent refineds is added, is then allowed to stand 40 minutes, obtains aluminium alloy；
4) so that furnace temperature is dropped to 695 DEG C, aluminium alloy is poured into pressure chamber, carry out die casting, injection speed remains 2m/s, when die casting
Between be 20s, obtain a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy.
Detect that the corrosion-resistant of embodiment 1, high temperature creep-resisting diecast magnesium alloy are steady under 150 DEG C, 50MPa test condition
State creep rate and creep strain are as shown in table 1；At 35 DEG C, 100 hours corrosion rates of 5%NaCl neutral salt spray test are as schemed
Shown in 3.
Embodiment 2
A kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy, is the Al made of the component of following mass percent:
9.0wt.%；Zn:0.8wt.%；Mn:0.35wt.%；RE:0.8wt.%；Yb:1.5wt.%；Sm:3.0wt.%；Sr:
0.8wt.%；Surplus is pure magnesium and inevitable impurity.
A kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy preparation process, steps are as follows:
1) by pure magnesium ingot, fine aluminium ingot, pure zinc ingot, the magnesium manganese intermediate alloy containing 2% manganese, containing the magnesium rare earth of 20% mischmetal
Intermediate alloy, the magnesium ytterbium intermediate alloy containing 15% ytterbium, the magnesium samarium intermediate alloy containing 20% samarium, the magnesium strontium intermediate alloy containing 15% strontium
Melting is carried out at 740 DEG C, stirring obtains uniform aluminium alloy in 15 minutes；
2) so that furnace temperature is risen to 750 DEG C, be passed through argon gas dehydrogenation, the ventilation duration is 30s；
3) after ventilating, 1.5% No. 6 solvent refineds is added, is then allowed to stand 60 minutes, obtains aluminium alloy；
4) so that furnace temperature is dropped to 700 DEG C, aluminium alloy is poured into pressure chamber, carry out die casting, injection speed remains 3m/s, when die casting
Between be 25s, obtain a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy.
Detect that the corrosion-resistant of embodiment 2, high temperature creep-resisting diecast magnesium alloy are steady under 150 DEG C, 50MPa test condition
State creep rate and creep strain are as shown in table 1；At 35 DEG C, 100 hours corrosion rates of 5%NaCl neutral salt spray test are as schemed
Shown in 3.
Fig. 1 is corrosion-resistant, high temperature creep-resisting diecast magnesium alloy as-cast metallographic structure prepared by the embodiment of the present invention 2.Fig. 1
Illustrate that the alloy structure of embodiment preparation is made of dendrite and equiax crystal, white tissue is primary crystal α-Mg, ash in figure
Color is eutectic α-Mg, and black is Mg17Al12.
Fig. 2 be the embodiment of the present invention 2 prepare corrosion-resistant, high temperature creep-resisting diecast magnesium alloy as cast condition Electronic Speculum tissue and
Al4Sr phase EDAX results.Fig. 2 illustrates that white bright wisp shape is mutually Al in SEM photograph4Sr phase, and there is part Zn to be enriched in the phase
In, Al4Sr phase is heat-staple second phase, can improve the croop property of alloy.
Embodiment 3
A kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy, is the Al made of the component of following mass percent:
10.0wt.%；Zn:1.0wt.%；Mn:0.4wt.%；RE:1.0wt.%；Yb:2.0wt.%；Sm:3.5wt.%；Sr:
1.2wt.%；Surplus is pure magnesium and inevitable impurity.
A kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy preparation process, steps are as follows:
1) by pure magnesium ingot, fine aluminium ingot, pure zinc ingot, the magnesium manganese intermediate alloy containing 2% manganese, containing the magnesium rare earth of 20% mischmetal
Intermediate alloy, the magnesium ytterbium intermediate alloy containing 15% ytterbium, the magnesium samarium intermediate alloy containing 20% samarium, the magnesium strontium intermediate alloy containing 15% strontium
Melting is carried out at 750 DEG C, stirring obtains uniform aluminium alloy in 15 minutes；
2) 750 DEG C of furnace temperature are kept, argon gas dehydrogenation is passed through, the ventilation duration is 30s；
3) after ventilating, 1.5% No. 6 solvent refineds is added, is then allowed to stand 50 minutes, obtains aluminium alloy；
4) so that furnace temperature is dropped to 720 DEG C, aluminium alloy is poured into pressure chamber, carry out die casting, injection speed remains 3m/s, when die casting
Between be 30s, obtain a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy.
Detect that the corrosion-resistant of embodiment 3, high temperature creep-resisting diecast magnesium alloy are steady under 150 DEG C, 50MPa test condition
State creep rate and creep strain are as shown in table 1；At 35 DEG C, 100 hours corrosion rates of 5%NaCl neutral salt spray test are as schemed
Shown in 3.
Embodiment 4
A kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy, is the Al made of the component of following mass percent:
7.0wt.%；Zn:0.5wt.%；Mn:0.3wt.%；RE:0.2wt.%；Yb:0.1wt.%；Sm:0.1wt.%；Sr:
0.1wt.%；Surplus is pure magnesium and inevitable impurity.
A kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy preparation process, steps are as follows:
1) by pure magnesium ingot, fine aluminium ingot, pure zinc ingot, the magnesium manganese intermediate alloy containing 2% manganese, containing the magnesium rare earth of 20% mischmetal
Intermediate alloy, the magnesium ytterbium intermediate alloy containing 15% ytterbium, the magnesium samarium intermediate alloy containing 20% samarium, the magnesium strontium intermediate alloy containing 15% strontium
Melting is carried out at 750 DEG C, stirring obtains uniform aluminium alloy in 15 minutes；
2) 750 DEG C of furnace temperature are kept, argon gas dehydrogenation is passed through, the ventilation duration is 30s；
3) after ventilating, 1.5% No. 6 solvent refineds is added, is then allowed to stand 50 minutes, obtains aluminium alloy；
4) so that furnace temperature is dropped to 720 DEG C, aluminium alloy is poured into pressure chamber, carry out die casting, injection speed remains 3m/s, when die casting
Between be 20s, obtain a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy.
Detect that the corrosion-resistant of embodiment 4, high temperature creep-resisting diecast magnesium alloy are steady under 150 DEG C, 50MPa test condition
State creep rate and creep strain are as shown in table 1；At 35 DEG C, 100 hours corrosion rates of 5%NaCl neutral salt spray test are as schemed
Shown in 3.
Embodiment 5
A kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy, is the Al made of the component of following mass percent:
11.5wt.%；Zn:2.0wt.%；Mn:0.4wt.%；RE:2.5wt.%；Yb:3.3wt.%；Sm:5.8wt.%；Sr:
2.0wt.%；Surplus is pure magnesium and inevitable impurity.
A kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy preparation process, steps are as follows:
1) by pure magnesium ingot, fine aluminium ingot, pure zinc ingot, the magnesium manganese intermediate alloy containing 2% manganese, containing the magnesium rare earth of 20% mischmetal
Intermediate alloy, the magnesium ytterbium intermediate alloy containing 15% ytterbium, the magnesium samarium intermediate alloy containing 20% samarium, the magnesium strontium intermediate alloy containing 15% strontium
Melting is carried out at 750 DEG C, stirring obtains uniform aluminium alloy in 15 minutes；
2) 750 DEG C of furnace temperature are kept, argon gas dehydrogenation is passed through, the ventilation duration is 30s；
3) after ventilating, 1.5% No. 6 solvent refineds is added, is then allowed to stand 60 minutes, obtains aluminium alloy；
4) so that furnace temperature is dropped to 720 DEG C, aluminium alloy is poured into pressure chamber, carry out die casting, injection speed remains 3m/s, when die casting
Between be 40s, obtain a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy.
Detect that the corrosion-resistant of embodiment 5, high temperature creep-resisting diecast magnesium alloy are steady under 150 DEG C, 50MPa test condition
State creep rate and creep strain are as shown in table 1；At 35 DEG C, 100 hours corrosion rates of 5%NaCl neutral salt spray test are as schemed
Shown in 3.
Comparative example
Comparative example is AZ91 diecast magnesium alloy, is the Al:9.0wt.% made of the component of following mass percent；Zn:
0.8wt.%；Mn:0.3wt.%；Surplus is pure magnesium and inevitable impurity.
Comparative example A Z91 diecast magnesium alloy preparation process, steps are as follows:
1) magnesium source, silicon source, zinc source, manganese source being subjected to melting, obtains uniform aluminium alloy, smelting temperature is maintained at 740 ±
It 10 DEG C, stirs 15 minutes；
2) so that furnace temperature is risen to 750 DEG C, be passed through argon gas dehydrogenation；
3) after ventilating, No. 6 solvent refineds is added, are then allowed to stand 30 minutes.
4) so that furnace temperature is dropped to 700 DEG C, aluminium alloy is poured into pressure chamber, carries out die casting, injection speed remains 3m/s, pressed
Cast AZ91 magnesium alloy.
Detect secondary creep rates and creep of the comparative example A Z91 diecast magnesium alloy under 150 DEG C, 50MPa test condition
Strain is as shown in table 1；At 35 DEG C, 100 hours corrosion rates of 5%NaCl neutral salt spray test are as shown in Figure 3.
In specific implementation process, smelting temperature requires 730~760 DEG C；695~720 DEG C of the temperature requirement of die casting, manganese source,
The addition in ytterbium source, samarium source, mischmetal source, barium source is with intermediate alloy (Mg-2%Mn, Mg-15%Yb, Mg-20%Sm, Mg-
20%RE, Mg-15%Sr) mode be added.
Table 1
The above is the preferred embodiments of the invention, it is noted that technical staff general for the art
For, under the premise of not departing from the principle and core concept of the invention patent, several modification and improvement can also be made, this
A little modifications and improvement are also considered as within the scope of protection of the patent of the present invention.
Claims (8)
1. a kind of corrosion-resistant, high temperature creep-resisting diecast magnesium alloy, which is characterized in that the mass percent of its composition and each component is such as
Under:
Al:7.0~11.5wt.%,
Zn:0.5~2.0wt.%,
Mn:0.3~0.4wt.%,
RE:0.2~2.5wt.%,
Yb:0.1~3.3wt.%,
Sm:0.1~5.8wt.%,
Sr:0.1~2.0wt.%,
Surplus is Mg and inevitable impurity element, and RE is mischmetal.
2. one kind according to claim 1 is corrosion-resistant, high temperature creep-resisting diecast magnesium alloy, which is characterized in that described one kind
Corrosion-resistant, high temperature creep-resisting diecast magnesium alloy, the mass percent of each component are as follows:
Al:9.0wt.%,
Zn:0.8wt.%,
Mn:0.35wt.%,
RE:0.8wt.%,
Yb:1.5wt.%,
Sm:3.0wt.%,
Sr:0.8wt.%,
Surplus is Mg and inevitable impurity element, and RE is mischmetal.
3. one kind described in -2 any one is corrosion-resistant according to claim 1, preparation method of high temperature creep-resisting diecast magnesium alloy,
Characterized by comprising the following steps:
Step 1: magnesium source, silicon source, zinc source, manganese source, mischmetal source, ytterbium source, samarium source and barium source are carried out melting, obtain uniformly
Aluminium alloy；Smelting temperature is 730~760 DEG C in the step one, smelting time 10-15min；
Step 2: the aluminium alloy that step 1 is obtained, which pours into cold-chamber die casting machine, carries out die casting, obtain a kind of corrosion-resistant, resistant to high temperatures compacted
Become diecast magnesium alloy；Cast temperature is 695~720 DEG C in the step 2, and the die casting time is 20~40s.
4. one kind according to claim 3 is corrosion-resistant, the preparation method of high temperature creep-resisting diecast magnesium alloy, feature exists
In magnesium source is pure magnesium ingot in the step 1, and silicon source is fine aluminium ingot, and zinc source is pure zinc ingot.
5. one kind according to claim 3 is corrosion-resistant, the preparation method of high temperature creep-resisting diecast magnesium alloy, feature exists
In manganese source is the magnesium manganese intermediate alloy containing 2% manganese in the step one, and mischmetal source is that the magnesium containing 20% mischmetal is dilute
Native intermediate alloy, ytterbium source is magnesium ytterbium intermediate alloy containing 15% ytterbium, samarium source be the magnesium samarium intermediate alloy containing 20% samarium, barium source for containing
The magnesium strontium intermediate alloy of 15% strontium.
6. one kind according to claim 3 is corrosion-resistant, the preparation method of high temperature creep-resisting diecast magnesium alloy, feature exists
In, the mischmetal be cerium-rich mischmetal, specific ingredient are as follows: Ce:65%, La:34.6%, Pr:0.10%, Nd:
0.18%, Fe:0.07%, Si:0.03%, Cu:0.01%, Ni:0.01%.
7. one kind according to claim 3 is corrosion-resistant, the preparation method of high temperature creep-resisting diecast magnesium alloy, feature exists
In the step 1, when smelting temperature reaches 750 DEG C, is passed through argon gas dehydrogenation in fusion process.
8. one kind according to claim 3 is corrosion-resistant, the preparation method of high temperature creep-resisting diecast magnesium alloy, feature exists
In No. 6 flux being added and are refined, 40~60min is then allowed to stand after being passed through argon gas dehydrogenation in step 1.
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| CN107815574A (en) * | 2017-09-28 | 2018-03-20 | 江苏晶王新材料科技有限公司 | A kind of corrosion resistant magnesium alloy materials |
| CN108179337B (en) * | 2017-12-25 | 2019-04-23 | 广东省材料与加工研究所 | A kind of diecast magnesium alloy and its pressure casting method of high temperature creep-resisting |
| CN110195180B (en) * | 2018-02-26 | 2021-10-19 | 中国宝武钢铁集团有限公司 | High-thermal-conductivity die-casting magnesium alloy and manufacturing method thereof |
| CN112647002A (en) * | 2020-12-25 | 2021-04-13 | 山西瑞格金属新材料有限公司 | High-toughness high-heat-conductivity magnesium alloy for ultrathin wall component and preparation method thereof |
| CN114000022A (en) * | 2021-10-29 | 2022-02-01 | 中国科学院长春应用化学研究所 | High-temperature and high-pressure resistant and ultra-long creep life rare earth magnesium alloy and preparation method thereof |
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| CN1637160A (en) * | 2004-01-09 | 2005-07-13 | 高田株式会社 | Die casting magnesium alloy and magnesium die casting |
| WO2005108634A1 (en) * | 2004-05-10 | 2005-11-17 | Norsk Hydro Technology B.V. | Magnesium alloy having improved elevated temperature performance |
| CN101469387A (en) * | 2007-12-29 | 2009-07-01 | 中国科学院长春应用化学研究所 | Yttrium-rich rare earth high-strength heat-resistant creep-resistant die-casting magnesium alloy |
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| CN1637160A (en) * | 2004-01-09 | 2005-07-13 | 高田株式会社 | Die casting magnesium alloy and magnesium die casting |
| WO2005108634A1 (en) * | 2004-05-10 | 2005-11-17 | Norsk Hydro Technology B.V. | Magnesium alloy having improved elevated temperature performance |
| CN101469387A (en) * | 2007-12-29 | 2009-07-01 | 中国科学院长春应用化学研究所 | Yttrium-rich rare earth high-strength heat-resistant creep-resistant die-casting magnesium alloy |
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