JPS6148574B2 - - Google Patents
Info
- Publication number
- JPS6148574B2 JPS6148574B2 JP1387483A JP1387483A JPS6148574B2 JP S6148574 B2 JPS6148574 B2 JP S6148574B2 JP 1387483 A JP1387483 A JP 1387483A JP 1387483 A JP1387483 A JP 1387483A JP S6148574 B2 JPS6148574 B2 JP S6148574B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- strength
- alloy
- toughness
- present
- 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
Links
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 description 17
- 239000000956 alloy Substances 0.000 description 17
- 239000000463 material Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000011282 treatment Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 229910018571 Al—Zn—Mg Inorganic materials 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910021365 Al-Mg-Si alloy Inorganic materials 0.000 description 1
- 229910017706 MgZn Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Description
本発明は靭性に富むアルミニウム合金に関し、
詳しくは構造材用の中強度Al−Zn−Mg系合金の
靭性の改善に関する。
近年、アルミニウム合金の用途の拡大に伴い、
各種強度部材として構造材用の中強度合金の使用
量が増加しており、代表的な合金として、Al−
Mg−Si系合金ではJIS6061合金、Al−Zn−Mg系
合金ではJIS7N01合金がある。しかし、これらの
合金は強度的にはJISで定められているT5処理或
いはT6処理を施すことにより中強度合金として
十分な強度は得られるが、靭性が十分でないとい
う短所があり、そのため、靭性のすぐれた中強度
合金の開発が要求されていた。
本発明は上記の課題を解決することを目的とす
るものであつて、本発明のアルミニウム合金は、
Zn5.5〜6.5重量％、Mg0.8〜1.2重量％、Zr0.05〜
0.20重量％、Co0.05〜0.15重量％、Ti0.05〜0.15
重量％、Fe0.12重量％以下、Si0.10重量％以下、
残部がAl及び不可避的不純物からなることを特
徴とし、本発明合金は引張強さ及び耐力について
は中強度を有し、かつ靭性がすぐれている。
本発明合金における各成分組成の限定理由は次
の通りである。
Zn、MgはMgZn2を形成する主要な添加元素で
あり、Znが5.5重量％、Mgが0.8重量％に達しな
いと十分な強度が得られず、Znが6.5重量％、Mg
が1.2重量％を越えると応力腐食割れを生じ易く
なると共に加工性が低下する。
Zn、Co、Tiはマトリツクス中にZr系、Co系、
Ti系の化合物として析出し、合金の靭性の向上
に効果があるが、単独添加ではその効果は余り期
待できない。Zr、Tiは応力腐食割れの防止にも
効果がある。Zrが0.05重量％、Coが0.05重量％、
Tiが0.05重量％よりも少ないと靭性の向上が不十
分であり、Zrが0.20重量％、Coが0.15重量％、Ti
が0.15重量％を越えると巨大化合物が形成される
結果、靭性及び加工性が低下する。
本発明合金には原料より必然的に混入する不純
物があるが、靭性のすぐれた中強度合金を得るた
めには、Feは0.12重量％以下、Siは0.10重量％以
下に維持する必要がある。Feが0.12重量％を越
えると靭性が低下し、Siが0.10重量％を越えると
強度が低下する。
次に本発明の実施例を示す。第１表は本発明の
一実施例の合金成分組成である。これらの成分組
成の金型鋳塊（50mm×40mm×200mm）を常法によ
り作成し、460℃で６時間均質化処理したものか
ら丸棒（29mmφ×90mm）を切り出し、試験押出機
にて断面23mm×２mmの押出材を作成した。この押
出材より引張試験用としてJIS13B号試験片を90
゜曲げ試験用として23mm×２mm×60mmの試験片を
作成し、470℃で30分間溶体化処理を行つた。そ
の後、T4及びT5処理用としては冷却速度1.8℃/s
ｅｃで室温まで冷却した。またT6処理用としては
水冷した。T4処理は室温まで冷却後10日間室温
時効を行い、T5及びT6処理は120℃で24時間焼
もどし処理を行つた。
第２表は上記の時効を行つた試験片の常温にお
ける機械的性質である。すなわち、本発明合金は
引張強さは32〜39Kg/mm2、耐力は19〜31Kg/mm2であ
り、靭性の指標となる曲げ性Ｒ／ｔについてみる
とＲ／ｔ＝0.25で割れが発生することがなく、す
ぐれた靭性を有する。
以上に述べたように、本発明合金は、引張強さ
及び耐力については中強度を保持し、併せて靭性
において顕著にすぐれた特性を有しており、中強
度の構造材用合金として各種の用途に供すること
ができる。
The present invention relates to an aluminum alloy with high toughness,
More specifically, it relates to improving the toughness of medium-strength Al-Zn-Mg alloys for structural materials. In recent years, with the expansion of applications for aluminum alloys,
The use of medium-strength alloys for structural materials as various strength members is increasing, and Al-
Mg-Si alloys include JIS6061 alloy, and Al-Zn-Mg alloys include JIS7N01 alloy. However, in terms of strength, these alloys can obtain sufficient strength as medium-strength alloys by applying T5 or T6 treatment specified by JIS, but they have the disadvantage of insufficient toughness. There was a need for the development of an excellent medium-strength alloy. The present invention aims to solve the above problems, and the aluminum alloy of the present invention has
Zn5.5~6.5wt%, Mg0.8~1.2wt%, Zr0.05~
0.20wt%, Co0.05~0.15wt%, Ti0.05~0.15
Weight%, Fe0.12wt% or less, Si0.10wt% or less,
Characterized by the fact that the remainder consists of Al and unavoidable impurities, the alloy of the present invention has medium tensile strength and yield strength, and excellent toughness. The reason for limiting the composition of each component in the alloy of the present invention is as follows. Zn and Mg are the main additive elements that form MgZn 2 , and sufficient strength cannot be obtained unless Zn reaches 5.5% by weight and Mg reaches 0.8% by weight.
If it exceeds 1.2% by weight, stress corrosion cracking tends to occur and workability decreases. Zn, Co, and Ti are Zr-based, Co-based,
It precipitates as a Ti-based compound and is effective in improving the toughness of the alloy, but its effect cannot be expected when added alone. Zr and Ti are also effective in preventing stress corrosion cracking. Zr: 0.05% by weight, Co: 0.05% by weight,
If Ti is less than 0.05% by weight, the improvement in toughness is insufficient; if Zr is 0.20% by weight, Co is 0.15% by weight, Ti
If it exceeds 0.15% by weight, macrocompounds are formed, resulting in a decrease in toughness and processability. The alloy of the present invention inevitably contains impurities from the raw materials, but in order to obtain a medium-strength alloy with excellent toughness, it is necessary to maintain Fe at 0.12% by weight or less and Si at 0.10% by weight or less. When Fe exceeds 0.12% by weight, toughness decreases, and when Si exceeds 0.10% by weight, strength decreases. Next, examples of the present invention will be shown. Table 1 shows the alloy component composition of one embodiment of the present invention. A mold ingot (50 mm x 40 mm x 200 mm) with these compositions was prepared using a conventional method, homogenized at 460°C for 6 hours, and then a round bar (29 mmφ x 90 mm) was cut out and the cross section was cut using a test extruder. An extruded material of 23 mm x 2 mm was made. JIS No. 13B test pieces were made from this extruded material for tensile testing.
A test piece measuring 23 mm x 2 mm x 60 mm was prepared for the bending test, and solution treatment was performed at 470°C for 30 minutes. After that, cooling rate is 1.8℃/s for T4 and T5 processing.
Cooled to room temperature using EC. Also, for T6 processing, it was water-cooled. In the T4 treatment, room temperature aging was performed for 10 days after cooling to room temperature, and in the T5 and T6 treatments, tempering treatment was performed at 120°C for 24 hours. Table 2 shows the mechanical properties at room temperature of the test pieces subjected to the above aging. In other words, the alloy of the present invention has a tensile strength of 32 to 39 Kg/mm 2 and a yield strength of 19 to 31 Kg/mm 2 , and when looking at bendability R/t, which is an index of toughness, cracking occurs at R/t = 0.25. It has excellent toughness. As mentioned above, the alloy of the present invention maintains medium strength in terms of tensile strength and proof stress, and also has remarkable properties in terms of toughness, and is used as an alloy for various medium strength structural materials. It can be used for various purposes.
【表】【table】
【表】【table】
Claims (1)
Zr0.05〜0.20重量％、Co0.05〜0.15重量％、
Ti0.05〜0.15重量％、Fe0.12重量％以下、Si0.10
重量％以下、残部がAl及び不可避的不純物から
なり中強度を有する靭性に富むアルミニウム合
金。1 Zn5.5-6.5% by weight, Mg0.8-1.2% by weight,
Zr0.05-0.20% by weight, Co0.05-0.15% by weight,
Ti0.05~0.15wt%, Fe0.12wt% or less, Si0.10
An aluminum alloy with moderate strength and high toughness, with the balance consisting of Al and unavoidable impurities (weight% or less).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1387483A JPS59140346A (en) | 1983-01-31 | 1983-01-31 | Aluminum alloy with high toughness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1387483A JPS59140346A (en) | 1983-01-31 | 1983-01-31 | Aluminum alloy with high toughness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59140346A JPS59140346A (en) | 1984-08-11 |
| JPS6148574B2 true JPS6148574B2 (en) | 1986-10-24 |
Family
ID=11845369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1387483A Granted JPS59140346A (en) | 1983-01-31 | 1983-01-31 | Aluminum alloy with high toughness |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59140346A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3053352B2 (en) * | 1995-04-14 | 2000-06-19 | 株式会社神戸製鋼所 | Heat-treated Al alloy with excellent fracture toughness, fatigue properties and formability |
| JP4977281B2 (en) | 2005-09-27 | 2012-07-18 | アイシン軽金属株式会社 | High-strength aluminum alloy extruded material excellent in shock absorption and stress corrosion cracking resistance and method for producing the same |
| EP2141253B1 (en) * | 2007-03-26 | 2015-09-16 | Aisin Keikinzoku Co., Ltd. | Process for producing a 7000 aluminum alloy extrudate |
-
1983
- 1983-01-31 JP JP1387483A patent/JPS59140346A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59140346A (en) | 1984-08-11 |
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