JPH0676636B2 - Aluminum alloy with excellent resistance to stress corrosion cracking - Google Patents
Aluminum alloy with excellent resistance to stress corrosion crackingInfo
- Publication number
- JPH0676636B2 JPH0676636B2 JP61051077A JP5107786A JPH0676636B2 JP H0676636 B2 JPH0676636 B2 JP H0676636B2 JP 61051077 A JP61051077 A JP 61051077A JP 5107786 A JP5107786 A JP 5107786A JP H0676636 B2 JPH0676636 B2 JP H0676636B2
- Authority
- JP
- Japan
- Prior art keywords
- corrosion cracking
- stress corrosion
- aluminum alloy
- alloy
- strength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005336 cracking Methods 0.000 title claims description 21
- 230000007797 corrosion Effects 0.000 title claims description 20
- 238000005260 corrosion Methods 0.000 title claims description 20
- 229910000838 Al alloy Inorganic materials 0.000 title claims description 9
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 11
- 229910052726 zirconium Inorganic materials 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 description 19
- 239000000956 alloy Substances 0.000 description 19
- 229910018134 Al-Mg Inorganic materials 0.000 description 6
- 229910018467 Al—Mg Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 229910052684 Cerium Inorganic materials 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 2
- 229910052777 Praseodymium Inorganic materials 0.000 description 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910001122 Mischmetal Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001814 effect on stress Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 この発明は、押出材、圧延材、鋳造材として各種機械部
品、構造材等に用いられる非熱処理型アルミニウム合
金、特に耐応力腐食割れ性を改善した5000系のAl−Mg系
合金に関する。TECHNICAL FIELD The present invention has an improved non-heat treatment type aluminum alloy used for various machine parts such as extruded material, rolled material, cast material, structural material, etc., and particularly improved stress corrosion cracking resistance. It relates to 5000-based Al-Mg alloys.
なお、本発明書において合金組成に用いる「％」はいず
れも重量基準によるものとする。In the present invention, "%" used in the alloy composition is based on weight.
従来の技術と問題点 高強度でしかも押出、圧延、鋳造が可能な非熱処理型ア
ルミニウム合金として、5000系のAl−Mg系合金、例えば
5052、5056、5083、AC7A合金等が知られている。これら
の系の合金は非熱処理型合金であることから、熱処理を
省略できるのが特徴である。しかしながら、特にこの系
の合金は耐応力腐食割れ感受性が大きく、使用時の負荷
応力、又は環境によっては割れが生じることがある。し
かも、可及的大きい強度を得るためにはMgの含有量を増
加しなければならないが、Mgの含有量を増加すると、耐
応力腐食割れ性が益々増大する傾向を示すため、強度と
耐応力腐食割れ性の両面に充分な満足を得ることは甚だ
困難であった。Conventional technology and problems As a non-heat treatment type aluminum alloy having high strength and capable of extrusion, rolling and casting, 5000 series Al-Mg series alloys, for example,
5052, 5056, 5083, AC7A alloy and the like are known. Since these type of alloys are non-heat treatment type alloys, the feature is that heat treatment can be omitted. However, alloys of this system are particularly susceptible to stress corrosion cracking, and cracking may occur depending on the stress applied during use or the environment. Moreover, the Mg content must be increased in order to obtain as high strength as possible. However, as the Mg content increases, the stress corrosion cracking resistance tends to increase more and more. It has been extremely difficult to obtain sufficient satisfaction in terms of both corrosion cracking properties.
この発明は上記のような問題点に対し、Al−Mg系合金に
ついて比較的高率にMgの含有を許容して高強度を保有せ
しることを可能にしつつ、耐応力腐食割れ性の改善をは
かることを目的としてなされたものである。The present invention, with respect to the problems described above, allows the Al-Mg alloy to contain a relatively high percentage of Mg and retain high strength, while improving the resistance to stress corrosion cracking. It was made for the purpose of measuring.
問題点を解決する為の手段 この発明者は、上記のような目的において、種々実験と
研究の結果、5000系アルミニウム合金をベースとして、
これにＹ、La、Ce、Pr、Nd、Sm等の希土類元素を比較的
多く添加することにより、高強度を保有せしめつつ、耐
応力腐食割れ性の顕著な改善効果を果しうることを見出
すに至り、本発明を完成した。Means for Solving the Problems The present inventor has, as a result of various experiments and researches for the above-mentioned purpose, based on a 5000 series aluminum alloy,
It was found that by adding a relatively large amount of rare earth elements such as Y, La, Ce, Pr, Nd, and Sm to this, it is possible to achieve a significant improvement effect on stress corrosion cracking resistance while maintaining high strength. The present invention has been completed.
而して、この発明は、 Mg:2〜10％ 希土類元素のうち１種または２種以上:3.5〜10％ を含有し、あるいは更に、 Cu:0.05〜2.0％ および（または） Mn:0.1〜1.5％ Cr:0.05〜0.3％ Zr:0.05〜0.25％ のうちの１種または２種以上を含有し、残部アルミニウ
ム及び不純物からなる耐応力腐食割れ性に優れたアルミ
ニウム合金を要旨とする。Thus, the present invention contains Mg: 2 to 10% of one or more rare earth elements: 3.5 to 10%, or further Cu: 0.05 to 2.0% and / or Mn: 0.1 to. An aluminum alloy containing 1.5% Cr: 0.05 to 0.3% Zr: 0.05 to 0.25%, and one or more of which is excellent in stress corrosion cracking resistance consisting of balance aluminum and impurities.
上記各合金成分及びその成分割合の限定理由について説
明すれば次のとおりである。The reasons for limiting the above alloy components and their component ratios are described below.
必須元素であるMgは、既知のとおり主として合金の強度
向上に寄与するものであり、その含有量が２％未満で
は、充分な満足すべき強度を得ることができない。反面
10％を超えて含有してもさして強度向上せず、むしろ熱
間加工、冷間加工が困難になるため不適である。As is known, Mg, which is an essential element, mainly contributes to the improvement of the strength of the alloy, and if its content is less than 2%, sufficient satisfactory strength cannot be obtained. On the other hand
Even if the content exceeds 10%, the strength is not improved so much, and it is rather unsuitable because hot working and cold working become difficult.
他の必須元素として添加される希土類元素は、その元素
の種類が特に限定されるものではないが、具体的には例
えばＹ、La、Ce、Pr、Nd、Sm等を好適物として挙示しう
る。もちろん、これらの元素は必ずしも単体元素である
必要はなく、希土類金属の混合塩化物を電解して得られ
るミッシュメタルを用いてもよい。この希土類に属する
元素は、主に合金の耐応力腐食割れ性を改善する効果を
有する。この効果の点から、本発明においては当該希土
類元素のすべてを相互に実質的に均等物として評価しう
るものである。従って、その１種または２種以上を任意
に組合わせて用いうるが、合金中における含有量が総量
で3.5％未満では耐応力腐食割れ性の改善効果に不充分
である反面、10％を超えて含有しても耐応力腐食割れ性
はあまり向上せず、むしろコスト面での不利益の方が大
きいものとなる。The rare earth element added as another essential element is not particularly limited in the kind of the element, but specifically, for example, Y, La, Ce, Pr, Nd, Sm and the like can be listed as suitable substances. . Of course, these elements are not necessarily simple elements, and a misch metal obtained by electrolyzing a mixed chloride of a rare earth metal may be used. The elements belonging to this rare earth element mainly have the effect of improving the stress corrosion cracking resistance of the alloy. From the viewpoint of this effect, all the rare earth elements can be evaluated as substantially equivalent to each other in the present invention. Therefore, one kind or two or more kinds thereof can be used in an arbitrary combination, but if the total content in the alloy is less than 3.5%, the effect of improving the stress corrosion cracking resistance is insufficient, while it exceeds 10%. If it is included, the stress corrosion cracking resistance does not improve so much, but rather the cost disadvantage becomes greater.
Cuは、これも既知のとおり強度の向上に寄与するもので
あるが、含有量が0.05％未満ではその効果に十分でな
く、2.0％をこえるとかえって強度が低下するのみなら
ず、耐食性が急激に低下する。Cu also contributes to the improvement of strength as is also known, but if the content is less than 0.05%, it is not sufficient for its effect, and if it exceeds 2.0%, not only the strength decreases, but also the corrosion resistance increases sharply. Fall to.
その他の成分であるMn、Cr、Zrは、いずれも熱間加工時
の結晶粒の微細化に役立つものであり、Mn:0.1未満、C
r:0.05％未満、Zr:0.05％未満では上記効果に乏しく、M
n:1.5％超過、Cr:0.3％超過、Zr:0.25％超過の場合に
は、合金中に粗大な晶出物を生じて合金の機械的性質、
特に強度を低下する。Other components Mn, Cr, Zr are all useful for refining the crystal grains during hot working, Mn: less than 0.1, C
If r: less than 0.05% and Zr: less than 0.05%, the above effect is poor, and M
In the case of n: more than 1.5%, Cr: more than 0.3%, Zr: more than 0.25%, coarse crystallized substances are generated in the alloy to cause mechanical properties of the alloy,
Especially, the strength is reduced.
発明の効果 この発明は、上述したところから既に理解しうるよう
に、Mg:2.5〜５％、あるいは更にCu:0.05〜２％を含有
するAl−Mg系の合金において、従来合金では、応力腐食
割れ感受性が高いために使用時の負荷応力を上げること
ができず、ひいては薄肉、軽量化を満足に達成し得なか
ったのに対し、希土類元素の添加により、後掲の実施例
に示されるように耐応力腐食割れ性が顕著に改善される
ため、ひいては使用時の耐力設計が可能となった。しか
も、従来のAl−Mg系合金では、その強度を上げようとし
ても、Mgの添加量をせいぜい５％程度にまで増大しうる
にすぎず、故に強度向上にも限界があったが、上記の耐
応力腐食割れ性の改善により、Mg含有量を10％まで増大
することが可能となり、従って押出材、圧延材、鋳造材
等として各種機械部品、構造材等の用途において、従来
合金より更に一段と高強度化による薄肉軽量化、小型化
の達成を可能にし得た。EFFECTS OF THE INVENTION As can be understood from the above, the present invention is an Al-Mg alloy containing Mg: 2.5 to 5% or Cu: 0.05 to 2%. Due to its high cracking susceptibility, it was not possible to increase the load stress during use, and it was not possible to satisfactorily achieve thinness and weight reduction.However, the addition of rare earth elements, as shown in the examples below, Since the stress corrosion cracking resistance is remarkably improved, it is possible to design the yield strength during use. Moreover, in the conventional Al-Mg-based alloy, even if it is attempted to increase the strength, the amount of Mg added can only be increased to about 5% at most, and thus there is a limit to the strength improvement. By improving stress corrosion cracking resistance, it is possible to increase the Mg content up to 10%. It was possible to achieve thinness, weight reduction, and size reduction by increasing strength.
実施例 下記の第１表に示す各種化学組成の合金を、６インチビ
レットに金型鋳造した。その後、520℃で16時間の均質
処理を行い、次いで更に450℃にて厚さ20mm、幅50mmの
平角棒に押出した。その後、冷間圧延を20％の圧下率で
行ったものを供試材とした。Example Alloys having various chemical compositions shown in Table 1 below were die-cast on a 6-inch billet. After that, homogenization treatment was carried out at 520 ° C. for 16 hours, and then at 450 ° C., it was extruded into a rectangular rod having a thickness of 20 mm and a width of 50 mm. After that, cold rolling was performed at a reduction rate of 20% to obtain a test material.
そして、上記各供試材につき、それらの機械的性質を調
べると共に、応力腐食割れ試験を行った。結果を第２表
に示す。 Then, for each of the above-mentioned test materials, their mechanical properties were examined, and a stress corrosion cracking test was conducted. The results are shown in Table 2.
上記第２表に見られるようにこの発明に係るAl−Mg系合
金は、その固有の性質としての機械的強度を損うことな
く、むしろ強度の増大をはかることを可能にしつつ、従
来のAl−Mg系合金に較べて、耐応力腐食割れ性を顕著に
改善しうるものであることがわかる。 As can be seen from Table 2 above, the Al-Mg alloy according to the present invention does not impair the mechanical strength as its inherent property, but rather enables the strength to be increased, while improving the conventional Al. It can be seen that the stress corrosion cracking resistance can be remarkably improved as compared with the Mg-based alloy.
Claims (4)
腐食割れ性に優れたアルミニウム合金。1. An aluminum alloy containing Mg: 2.0 to 10% and one or more of rare earth elements: 3.5 to 10%, the balance being aluminum and impurities, and having excellent resistance to stress corrosion cracking.
腐食割れ性に優れたアルミニウム合金。2. Mg: 2.0 to 10% One or two or more rare earth elements: 3.5 to 10% Cu: 0.05 to 2.0% is contained, and the balance is excellent in stress corrosion cracking resistance consisting of aluminum and impurities. Aluminum alloy.
腐食割れ性に優れたアルミニウム合金。3. Mg: 2.0 to 10% One or more of rare earth elements: 3.5 to 10% and Mn: 0.1 to 1.5% Cr: 0.05 to 0.3% Zr: 0.05 to 0.25% An aluminum alloy containing one or more of the above and having the balance of aluminum and impurities and having excellent resistance to stress corrosion cracking.
腐食割れ性に優れたアルミニウム合金。4. Mg: 2.0 to 10% One or more rare earth elements: 3.5 to 10% Cu: 0.05 to 2.0% and Mn: 0.1 to 1.5% Cr: 0.05 to 0.3% Zr : An aluminum alloy containing 0.05 to 0.25% of 1 type or 2 types or more of which the balance is aluminum and impurities and is excellent in stress corrosion cracking resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61051077A JPH0676636B2 (en) | 1986-03-07 | 1986-03-07 | Aluminum alloy with excellent resistance to stress corrosion cracking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61051077A JPH0676636B2 (en) | 1986-03-07 | 1986-03-07 | Aluminum alloy with excellent resistance to stress corrosion cracking |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62207840A JPS62207840A (en) | 1987-09-12 |
| JPH0676636B2 true JPH0676636B2 (en) | 1994-09-28 |
Family
ID=12876746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61051077A Expired - Lifetime JPH0676636B2 (en) | 1986-03-07 | 1986-03-07 | Aluminum alloy with excellent resistance to stress corrosion cracking |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0676636B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113249623B (en) * | 2021-06-16 | 2022-07-26 | 广西隆林利通线缆科技有限公司 | Aluminum-magnesium alloy wire and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49134546A (en) * | 1973-04-30 | 1974-12-25 |
-
1986
- 1986-03-07 JP JP61051077A patent/JPH0676636B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62207840A (en) | 1987-09-12 |
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