JP2022127410A - Aluminum alloy extrusion material - Google Patents
Aluminum alloy extrusion material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 51
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 41
- 238000001125 extrusion Methods 0.000 title abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 239000004615 ingredient Substances 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 22
- 230000007797 corrosion Effects 0.000 abstract description 21
- 238000005260 corrosion Methods 0.000 abstract description 21
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 abstract description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 229910052719 titanium Inorganic materials 0.000 abstract description 2
- 229910052726 zirconium Inorganic materials 0.000 abstract description 2
- 230000035882 stress Effects 0.000 description 28
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 11
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 11
- 230000032683 aging Effects 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910018571 Al—Zn—Mg Inorganic materials 0.000 description 1
- 229910017708 MgZn2 Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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Abstract
Description
本開示はアルミニウム合金押出材に関する。 The present disclosure relates to aluminum alloy extrusions.
従来、フレーム材に用いられるアルミニウム部材として、高強度の６０００系アルミニウム合金押出材が主に使用されてきた。しかし、６０００系アルミニウム合金は焼入れ感受性が高く、焼入れによって歪が生じやすいために、精度が要求される部材への適用は難しい。そこで、応力腐食割れの問題があるものの焼入れ感受性が低い７０００系アルミニウム合金のフレーム材への適用が試みられている。 Conventionally, high-strength 6000 series aluminum alloy extruded materials have been mainly used as aluminum members used for frame materials. However, 6000-series aluminum alloys are highly sensitive to quenching and tend to be distorted by quenching, making it difficult to apply them to members that require precision. Therefore, attempts have been made to apply 7000 series aluminum alloys, which have a problem of stress corrosion cracking but have low quenching susceptibility, to frame materials.
特許文献１には、合金組成等を制御することにより耐応力腐食割れ性に優れた７０００系アルミニウム合金部材の製造方法が開示されており、具体的にはクロム酸促進法による耐応力腐食割れ試験を行って、割れが少なくとも１２時間発生しないアルミニウム合金部材が開示されている。 Patent Document 1 discloses a method for producing a 7000-series aluminum alloy member having excellent stress corrosion cracking resistance by controlling the alloy composition, etc. Specifically, a stress corrosion cracking resistance test by a chromic acid accelerated method is disclosed. and crack-free aluminum alloy members are disclosed for at least 12 hours.
特許文献２には、合金組成等を制御することによりＴ６処理材の強度と靭性、金属組織及び耐応力腐食割れ性を改善したＡｌ－Ｚｎ－Ｍｇ系合金押出材（すなわち７０００系アルミニウム合金押出材）とその製造方法が開示されており、具体的にはクロム酸促進試験により、割れが１２時間発生しない合金押出材が開示されている。
しかしながら、特許文献１および２に開示されるような従来技術では、クロム酸促進試験を１２時間超行った場合に割れが発生するおそれがあることがわかり、耐応力腐食割れ性に更なる改善の余地があることがわかった。
However, in the conventional techniques disclosed in
本発明はこのような状況に鑑みてなされたものであり、その目的の１つは、フレーム材として十分な強度にでき、かつ耐応力腐食割れ性が改善されたアルミニウム合金押出材を提供することである。 The present invention has been made in view of such circumstances, and one of its objects is to provide an aluminum alloy extruded material that can be made sufficiently strong as a frame material and has improved resistance to stress corrosion cracking. is.
本発明の態様１は、
成分組成が、
Ｚｎ：３．０～６．０質量％、
Ｍｇ：０．４～１．４質量％、
Ｆｅ：０．０５～０．２質量％、
Ｃｕ：０．０５～０．２質量％、
Ｔｉ：０．００５～０．２質量％、
Ｚｒ：０．１～０．３質量％、および
残部：Ａｌおよび不可避不純物からなり、
Ｚｎ／Ｍｇの質量比が２．９２～４．３５または８．９４～９．１２である、アルミニウム合金押出材である。
Aspect 1 of the present invention is
Ingredient composition
Zn: 3.0 to 6.0% by mass,
Mg: 0.4 to 1.4% by mass,
Fe: 0.05 to 0.2% by mass,
Cu: 0.05 to 0.2% by mass,
Ti: 0.005 to 0.2% by mass,
Zr: 0.1 to 0.3% by mass, and the balance: Al and inevitable impurities,
An aluminum alloy extruded material having a Zn/Mg mass ratio of 2.92 to 4.35 or 8.94 to 9.12.
本発明の態様２は、
前記Ｚｎ／Ｍｇの質量比が３．１５～４．００である、態様１に記載のアルミニウム合金押出材である。
The aluminum alloy extruded material according to aspect 1, wherein the Zn/Mg mass ratio is 3.15 to 4.00.
本発明の態様３は、
耐力が２６０ＭＰａ以上である、態様１または２に記載のアルミニウム合金押出材である。
Aspect 3 of the present invention is
3. The aluminum alloy extruded material according to
本発明の態様４は、
前記耐力が２７０ＭＰａ以上である、態様３に記載のアルミニウム合金押出材である。
The aluminum alloy extruded material according to aspect 3, wherein the proof stress is 270 MPa or more.
本発明の実施形態によれば、フレーム材として十分な強度にでき、かつ耐応力腐食割れ性が改善されたアルミニウム合金押出材を提供することが可能である。 According to the embodiments of the present invention, it is possible to provide an aluminum alloy extruded material that can be made sufficiently strong as a frame material and has improved resistance to stress corrosion cracking.
本発明者らは、フレーム材として十分な強度にでき、かつ耐応力腐食割れ性が改善されたアルミニウム合金押出材を実現するべく、様々な角度から検討した。その結果、Ｚｎ、Ｍｇ、Ｆｅ、Ｃｕ、ＴｉおよびＺｒを必須で含み、それらの含有量を所定範囲に制御するとともに、Ｚｎ／Ｍｇ質量比を２．９２～４．３５または８．９４～９．１２という非常に狭い範囲に限定することにより、フレーム材として十分な強度にでき、かつ耐応力腐食割れ性が改善されたアルミニウム合金押出材を実現できることを見出した。 The present inventors have studied from various angles in order to realize an aluminum alloy extruded material that can have sufficient strength as a frame material and has improved resistance to stress corrosion cracking. As a result, Zn, Mg, Fe, Cu, Ti and Zr are essential, their contents are controlled within a predetermined range, and the Zn/Mg mass ratio is 2.92 to 4.35 or 8.94 to 9 It was found that by limiting the range to a very narrow range of 0.12, an aluminum alloy extruded material having sufficient strength as a frame material and improved resistance to stress corrosion cracking can be realized.
以下に、本発明の実施形態が規定する各要件の詳細を示す。 Details of each requirement defined by the embodiments of the present invention are shown below.
本発明の実施形態に係るアルミニウム合金押出材は、成分組成が、Ｚｎ：３．０～６．０質量％、Ｍｇ：０．４～１．４質量％、Ｆｅ：０．０５～０．２質量％、Ｃｕ：０．０５～０．２質量％、Ｔｉ：０．００５～０．２質量％、Ｚｒ：０．１～０．３質量％を含み、さらに、残部がアルミニウムおよび不可避不純物であることが好ましい。また、Ｚｎ／Ｍｇの質量比が２．９２～４．３５または８．９４～９．１２である。
以下、各元素について詳述する。
The aluminum alloy extruded material according to the embodiment of the present invention has a chemical composition of Zn: 3.0 to 6.0 mass%, Mg: 0.4 to 1.4 mass%, Fe: 0.05 to 0.2. % by mass, Cu: 0.05 to 0.2% by mass, Ti: 0.005 to 0.2% by mass, Zr: 0.1 to 0.3% by mass, and the balance being aluminum and inevitable impurities Preferably. Also, the Zn/Mg mass ratio is 2.92 to 4.35 or 8.94 to 9.12.
Each element will be described in detail below.
（Ｚｎ：３．０～６．０質量％）
Ｚｎは、Ｍｇと共にアルミニウム合金押出材の強度を向上させる元素である。Ｚｎ含有量が３．０質量％未満では電池パックフレーム（バッテリーフレームとも称する）などのフレーム材として必要な耐力２６０ＭＰａ以上が得られない。一方、Ｚｎ含有量が６．０質量％超だと耐応力腐食割れ性および一般耐食性が低下する。よって、Ｚｎの含有量は３．０～６．０質量％とする。
(Zn: 3.0 to 6.0% by mass)
Zn is an element that improves the strength of the aluminum alloy extruded material together with Mg. If the Zn content is less than 3.0% by mass, a yield strength of 260 MPa or more required for a frame material such as a battery pack frame (also referred to as a battery frame) cannot be obtained. On the other hand, if the Zn content exceeds 6.0% by mass, stress corrosion cracking resistance and general corrosion resistance are lowered. Therefore, the Zn content is set to 3.0 to 6.0% by mass.
（Ｍｇ：０．４～１．４質量％）
ＭｇはＺｎと共にアルミニウム合金押出材の強度を向上させる元素である。Ｍｇ含有量が０．４質量％未満では電池パックフレームなどのフレーム材として必要な耐力２６０ＭＰａ以上が得られない。一方、Ｍｇ含有量が１．４質量％超だと、押出圧力の増大に伴い押出性が低下するとともに伸びも低下する。よって、Ｍｇの含有量は０．４～１．４質量％とする。
(Mg: 0.4 to 1.4% by mass)
Mg is an element that improves the strength of the aluminum alloy extruded material together with Zn. If the Mg content is less than 0.4% by mass, a yield strength of 260 MPa or more required for a frame material such as a battery pack frame cannot be obtained. On the other hand, if the Mg content exceeds 1.4% by mass, the extrudability is lowered and the elongation is lowered as the extrusion pressure increases. Therefore, the content of Mg is set to 0.4 to 1.4% by mass.
（Ｆｅ：０．０５～０．２質量％）
Ｆｅはアルミニウム合金の主要な不可避不純物であり、アルミニウム合金押出材の諸特性を低下させないため、０．２質量％以下とする。一方、アルミニウム合金押出材中のＦｅを０．０５質量％未満に低減することはコスト面の負担が大きい。よって、Ｆｅ含有量は０．０５～０．２質量％とする。
(Fe: 0.05 to 0.2% by mass)
Fe is a major unavoidable impurity in aluminum alloys, and is made 0.2% by mass or less so as not to degrade various properties of aluminum alloy extruded materials. On the other hand, reducing the Fe content in the aluminum alloy extruded material to less than 0.05% by mass imposes a large cost burden. Therefore, the Fe content is set to 0.05 to 0.2% by mass.
（Ｃｕ：０．０５～０．２質量％）
Ｃｕはアルミニウム合金押出材の強度を向上させる元素である。Ｃｕ含有量が０．０５質量％未満では十分な強度向上効果が無く、一方、０．２質量％超だと押出性の低下を招く。よって、Ｃｕ含有量は０．０５～０．２質量％とする。
(Cu: 0.05 to 0.2% by mass)
Cu is an element that improves the strength of the aluminum alloy extruded material. If the Cu content is less than 0.05% by mass, there is no sufficient strength improvement effect, while if it exceeds 0.2% by mass, the extrudability is lowered. Therefore, the Cu content is set to 0.05 to 0.2% by mass.
（Ｔｉ：０．００５～０．２質量％）
Ｔｉは、押出材の成形性を向上させる作用があり、０．００５質量％以上を添加する。一方、０．２質量％超だとその作用が飽和し、粗大な金属間化合物が晶出して破壊の起点になりうるため機械的性質が低下する。よって、Ｔｉ含有量は０．００５～０．２質量％とし、好ましくは０．００５～０．１質量％とし、より好ましくは０．００５～０．０５質量％とする。
(Ti: 0.005 to 0.2% by mass)
Ti has the effect of improving the formability of the extruded material, and is added in an amount of 0.005% by mass or more. On the other hand, if it exceeds 0.2% by mass, the action is saturated, and coarse intermetallic compounds crystallize, which can become starting points of fracture, resulting in deterioration of mechanical properties. Therefore, the Ti content is 0.005 to 0.2% by mass, preferably 0.005 to 0.1% by mass, more preferably 0.005 to 0.05% by mass.
（Ｚｒ：０．１～０．３質量％）
Ｚｒはアルミニウム合金押出材の再結晶を抑制して、耐応力腐食割れ性を向上させる作用がある。Ｚｒの含有量が０．１質量％未満では前記効果が十分ではなく、０．３質量％超だと押出性が低下し、さらに焼入れ感受性を高めて強度低下を招く。よって、Ｚｒ含有量は０．１～０．３質量％とする。
(Zr: 0.1 to 0.3% by mass)
Zr has the effect of suppressing recrystallization of the aluminum alloy extruded material and improving stress corrosion cracking resistance. If the Zr content is less than 0.1% by mass, the above effects are not sufficient, and if it exceeds 0.3% by mass, the extrudability is lowered and the quenching sensitivity is increased, resulting in a decrease in strength. Therefore, the Zr content should be 0.1 to 0.3% by mass.
本発明の実施形態に係るアルミニウム合金押出材は、上記の成分組成を含み、本発明の１つの実施形態では、残部はアルミニウムおよび不可避不純物であることが好ましい。不可避不純物として、原料、資材、製造設備等の状況によって持ち込まれる元素の混入が許容される。なお、例えば、Ｆｅのように、通常、含有量が少ないほど好ましく、従って不可避不純物であるが、その組成範囲について上記のように別途規定している元素がある。このため、本明細書において、「不可避不純物」という場合は、別途その組成範囲が規定されている元素を除いた概念である。
不可避不純物としては、Ｍｎ、ＳｉおよびＣｒなどが挙げられ、ＭｎおよびＣｒを除くものについては、単体で０．０５質量％以下とすることが好ましい。Ｃｒについては、Ｃｒ含有量が多いと押出工程において焼き付きが発生しやすくなるため、０．１２質量％以下とすることが好ましい。また、Ｍｎについては、Ｍｎ含有量が多いと押出圧力を増大させて押出性を低下させるおそれがあるため、０．０５質量％未満とすることが好ましい。また、不可避不純物は総量で０．２０質量％以下することが好ましい。
An aluminum alloy extruded material according to an embodiment of the present invention preferably contains the above composition, and in one embodiment of the present invention, the balance is aluminum and unavoidable impurities. As unavoidable impurities, contamination of elements brought in depending on the conditions of raw materials, materials, manufacturing equipment, etc. is allowed. It should be noted that, for example, there are elements, such as Fe, which are generally preferably contained in as small amounts as possible and are therefore unavoidable impurities, but whose composition ranges are separately defined as described above. Therefore, in this specification, the term "inevitable impurities" is a concept excluding elements whose composition range is separately defined.
The unavoidable impurities include Mn, Si, Cr, and the like, and it is preferable that the content of those other than Mn and Cr be 0.05% by mass or less. As for Cr, if the Cr content is high, seizure tends to occur in the extrusion process, so it is preferable to make the Cr content 0.12% by mass or less. Also, with regard to Mn, if the Mn content is high, the extrusion pressure may increase and the extrudability may deteriorate, so the Mn content is preferably less than 0.05% by mass. In addition, the total amount of unavoidable impurities is preferably 0.20% by mass or less.
（Ｚｎ／Ｍｇの質量比が２．９２～４．３５または８．９４～９．１２）
本発明者らは、Ｚｎ／Ｍｇの質量比が耐力に影響することを見出した。図１にＺｎ／Ｍｇの質量比に対する耐力の関係を示し、ドットパターンで示される領域は耐力が２６０ＭＰａ以上である領域を示す。図１からわかるように、Ｚｎ／Ｍｇ質量比が５付近では、Ｚｎ／Ｍｇ原子比（モル比）がＭｇＺｎ２の組成比である２付近となり、その場合に耐力が最大となる。換言すると、Ｚｎ／Ｍｇ質量比が約５の場合を基準として、高Ｚｎ／Ｍｇ比側および低Ｚｎ／Ｍｇ比側では耐力が低下し、Ｚｎ／Ｍｇ質量比が２．９２～９．１２であれば、電池パックフレームなどのフレーム材として十分な強度（耐力２６０ＭＰａ以上）にでき、Ｚｎ／Ｍｇ質量比が３．１５～８．３２であれば、より高強度（耐力２７０ＭＰａ以上）にできる。
さらに、本発明者らは、Ｚｎ／Ｍｇの質量比が耐応力腐食割れ性にも影響することを見出した。図２にＺｎ／Ｍｇの質量比に対する、耐応力腐食割れ性を指標となるクロム酸促進試験による割れ寿命の関係を示し、ドットパターンで示される領域は割れ寿命が１２．５時間以上である領域を示す。図２からわかるように、Ｚｎ／Ｍｇの質量比が４．３５以下と小さいか、または８．９４以上と大きい場合に、クロム酸促進試験による割れ寿命が１２．５時間以上となって耐応力腐食割れ性を改善でき、Ｚｎ／Ｍｇの質量比を４．００以下または９．７４以上とすることにより、クロム酸促進試験による割れ寿命が１４時間以上となって耐応力腐食割れ性をさらに改善できる。
そして、Ｚｎ／Ｍｇの質量比を２．９２～４．３５または８．９４～９．１２とすることにより、フレーム材として十分な強度（例えば、強度の１つの指標である耐力（０．２％耐力）が２６０ＭＰａ以上）にできるとともに、耐応力腐食割れ性が改善された（具体的にはクロム酸促進試験による割れ寿命が１２．５時間以上の）アルミニウム合金押出材を実現した。なお、Ｚｎ／Ｍｇの質量比について、「８．９４～９．１２」の範囲よりも「２．９２～４．３５」の範囲の方が高い耐力で耐応力腐食割れ性が高まるため、Ｚｎ／Ｍｇの質量比は「２．９２～４．３５」とする方が好ましい。さらに、耐力２７０ＭＰａ以上にできるとともに、クロム酸促進試験による割れ寿命が１４時間以上のアルミニウム合金押出材を得るために、Ｚｎ／Ｍｇ質量比を３．１５～４．００とすることが好ましい。
(The mass ratio of Zn/Mg is 2.92 to 4.35 or 8.94 to 9.12)
The inventors have found that the Zn/Mg mass ratio affects yield strength. FIG. 1 shows the relationship between yield strength and the mass ratio of Zn/Mg, and the region indicated by the dot pattern indicates the yield strength of 260 MPa or more. As can be seen from FIG. 1, when the Zn/Mg mass ratio is around 5, the Zn/Mg atomic ratio (molar ratio) is around 2 , which is the composition ratio of MgZn2, and the yield strength is maximized in that case. In other words, when the Zn/Mg mass ratio is about 5 as a reference, the proof stress decreases on the high Zn/Mg ratio side and on the low Zn/Mg ratio side, and when the Zn/Mg mass ratio is 2.92 to 9.12 If there is, sufficient strength (yield strength of 260 MPa or more) can be obtained as a frame material such as a battery pack frame.
Furthermore, the inventors have found that the Zn/Mg mass ratio also affects stress corrosion cracking resistance. FIG. 2 shows the relationship between the mass ratio of Zn/Mg and the cracking life in a chromic acid accelerated test, which is an index of stress corrosion cracking resistance. The region indicated by the dot pattern is the region where the cracking life is 12.5 hours or more indicates As can be seen from FIG. 2, when the Zn/Mg mass ratio is as small as 4.35 or less or as large as 8.94 or more, the cracking life in the chromic acid accelerated test is 12.5 hours or more, resulting in stress resistance. Corrosion cracking resistance can be improved, and by setting the Zn/Mg mass ratio to 4.00 or less or 9.74 or more, the crack life in a chromic acid accelerated test becomes 14 hours or more, further improving stress corrosion cracking resistance. can.
By setting the Zn/Mg mass ratio to 2.92 to 4.35 or 8.94 to 9.12, sufficient strength as a frame material (for example, yield strength (0.2 (% proof stress) of 260 MPa or more) and improved stress corrosion cracking resistance (specifically, a crack life of 12.5 hours or more in a chromic acid accelerated test) was realized. Regarding the mass ratio of Zn/Mg, the range of "2.92 to 4.35" has higher yield strength and stress corrosion cracking resistance than the range of "8.94 to 9.12". /Mg mass ratio is preferably from 2.92 to 4.35. Furthermore, the Zn/Mg mass ratio is preferably 3.15 to 4.00 in order to obtain an aluminum alloy extruded material having a yield strength of 270 MPa or more and a crack life of 14 hours or more in a chromic acid accelerated test.
本発明の実施形態に係るアルミニウム合金押出材は上記のような化学成分組成を有していればよく、押出材の形状等も特に制限されない。また、本発明の実施形態に係るアルミニウム合金押出材の製造方法は、本発明の目的を達成する上で特に制限されず、公知の方法で製造することができる。 The aluminum alloy extruded material according to the embodiment of the present invention only needs to have the chemical composition as described above, and the shape of the extruded material is not particularly limited. In addition, the method for producing the aluminum alloy extruded material according to the embodiment of the present invention is not particularly limited in achieving the object of the present invention, and the aluminum alloy extruded material can be produced by a known method.
本発明の実施形態に係るアルミニウム合金押出材は、一般的な人工時効処理によって、耐力を２６０ＭＰａ以上にできる。より好ましくは耐力が２７０ＭＰａ以上であることである。また、一般的な人工時効処理後の引張強度は３３０ＭＰａ以上であることが好ましく、一般的な人工時効処理後の伸びは１０％以上であることが好ましく１１％以上であることがより好ましい。 The aluminum alloy extruded material according to the embodiment of the present invention can have a yield strength of 260 MPa or more by general artificial aging treatment. More preferably, the proof stress is 270 MPa or more. Further, the tensile strength after general artificial aging treatment is preferably 330 MPa or more, and the elongation after general artificial aging treatment is preferably 10% or more, more preferably 11% or more.
以下、実施例を挙げて本発明の実施形態をより具体的に説明する。本発明の実施形態は以下の実施例によって制限を受けるものではなく、前述および後述する趣旨に合致し得る範囲で、適宜変更を加えて実施することも可能であり、それらはいずれも本発明の実施形態の技術的範囲に包含される。 EXAMPLES The embodiments of the present invention will be described in more detail below with reference to examples. The embodiments of the present invention are not limited by the following examples, and can be implemented with appropriate modifications within the scope that can match the spirit described above and below. It is included in the technical scope of the embodiment.
表１に示す成分組成のアルミニウム合金ビレットＡを造塊し、４７０℃６時間の均質化処理を行った。室温まで空冷した後、ビレット温度４８０℃、ダイス温度４５０℃、コンテナ温度４５０℃、押出比６０．９、押出速度４ｍ／分で押出加工を行い、断面形状を厚さ３ｍｍ、幅１１０ｍｍの平板とした。その後、人工時効処理として、一般的な７０００系アルミニウム合金のＴ７条件である７０℃×５時間＋１６５℃×６時間の熱処理を行った。得られたアルミニウム合金押出材に対して、以下に示す引張試験および耐応力腐食割れ性試験を行った。 An aluminum alloy billet A having the chemical composition shown in Table 1 was cast and homogenized at 470° C. for 6 hours. After air cooling to room temperature, extrusion is performed at a billet temperature of 480 ° C., a die temperature of 450 ° C., a container temperature of 450 ° C., an extrusion ratio of 60.9, and an extrusion speed of 4 m / min. did. After that, as an artificial aging treatment, a heat treatment of 70° C.×5 hours+165° C.×6 hours, which is the T7 conditions for general 7000 series aluminum alloys, was performed. The obtained aluminum alloy extruded material was subjected to the following tensile test and stress corrosion cracking resistance test.
＜引張試験＞
アルミニウム合金押出材からＪＩＳ１３Ｂの試験片を引張方向が押出方向（Ｌ方向）と平行になるように各２本切出し、ＪＩＳＺ２２４１に規定する金属材料試験方法に準じて引張試験を行い、引張強さ、耐力および伸びを測定した。
<Tensile test>
Two JIS13B test pieces are cut out from the aluminum alloy extruded material so that the tensile direction is parallel to the extrusion direction (L direction), and a tensile test is performed according to the metal material test method specified in JISZ2241. Yield strength and elongation were measured.
＜耐応力腐食割れ性試験（クロム酸促進試験）＞
アルミニウム合金押出材に応力を３点曲げ方式にて負荷した。応力負荷方向は横方向（ＬＴ方向）で、負荷応力水準は、それぞれの人工時効処理後の耐力に対して１００％を負荷した。その後、各２本ずつクロム酸沸騰溶液中に浸漬して２時間おきに１６時間まで目視観察を行い、いずれも割れが生じなかった最長時間を割れ寿命とした。表２に結果を示す。なお、１６時間経過後も割れが認められなかったものは、割れ寿命の欄に「１６」と記載した。
<Stress corrosion cracking resistance test (chromic acid accelerated test)>
A stress was applied to an aluminum alloy extruded material by a three-point bending method. The stress loading direction was the transverse direction (LT direction), and the load stress level was 100% of the proof stress after each artificial aging treatment. After that, two of each were immersed in a chromic acid boiling solution and visually observed every two hours up to 16 hours. Table 2 shows the results. If no cracks were observed even after 16 hours had elapsed, "16" was entered in the crack life column.
表２の結果より、次のように考察できる。表２の試験Ｎｏ．１は、いずれも本発明の実施形態で規定する要件を満足しており、フレーム材として十分な強度（耐力２６０ＭＰａ以上）を有するとともに、割れ寿命が少なくとも１２．５時間以上であり、耐応力腐食割れ性が改善されていた。
一方、表２の試験Ｎｏ．２～６は、いずれも本発明の実施形態で規定する要件（Ｚｎ／Ｍｇの質量比２．９２～４．３５または８．９４～９．１２）を満たしておらず、耐力が２６０ＭＰａ未満であるか、または割れ寿命が１２．５時間未満であった。
From the results in Table 2, the following can be considered. Test No. in Table 2. 1 satisfies the requirements specified in the embodiments of the present invention, has sufficient strength as a frame material (proof stress of 260 MPa or more), has a crack life of at least 12.5 hours or more, and is resistant to stress corrosion. Crackability was improved.
On the other hand, test no. 2 to 6 do not satisfy the requirements specified in the embodiments of the present invention (Zn/Mg mass ratio of 2.92 to 4.35 or 8.94 to 9.12), and the yield strength is less than 260 MPa. or the crack life was less than 12.5 hours.
Claims (4)
Ｚｎ：３．０～６．０質量％、
Ｍｇ：０．４～１．４質量％、
Ｆｅ：０．０５～０．２質量％、
Ｃｕ：０．０５～０．２質量％、
Ｔｉ：０．００５～０．２質量％、
Ｚｒ：０．１～０．３質量％、および
残部：Ａｌおよび不可避不純物からなり、
Ｚｎ／Ｍｇの質量比が２．９２～４．３５または８．９４～９．１２である、アルミニウム合金押出材。 Ingredient composition
Zn: 3.0 to 6.0% by mass,
Mg: 0.4 to 1.4% by mass,
Fe: 0.05 to 0.2% by mass,
Cu: 0.05 to 0.2% by mass,
Ti: 0.005 to 0.2% by mass,
Zr: 0.1 to 0.3% by mass, and the balance: Al and inevitable impurities,
An aluminum alloy extruded material having a Zn/Mg mass ratio of 2.92 to 4.35 or 8.94 to 9.12.
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