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A kind of aluminum alloy suitable for cold forming and its preparation method

An aluminum alloy and cold forming technology, applied in the field of aluminum alloy and its preparation, cold-formed aluminum alloy and its preparation, can solve the problems of cracking, parts are prone to cracks, and the yield of products is reduced, so as to improve the strength and improve the products. Yield, the effect of improving the plasticity of the alloy

Active Publication Date: 2020-08-14
上海纳特汽车标准件有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using the existing Al-Zn-Mg-Cu alloy and deformation process (such as cold upsetting) to produce products with large deformation, the parts are prone to cracks or even cracks, which reduces the product yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A high-performance aluminum alloy suitable for cold forming, the mass percentage of each component is: 2wt.% Zn, 6wt.% Mg, 3wt.% Mn, 0.2wt.% Cu, 2wt.% Sc , 2wt.% of Yb, 1wt.% of Tb, 0.2wt.% of Zr, and the balance is Al.

[0027] First alloy melting, including the following steps:

[0028] ① Baking materials: Take pure Al, Zn, Mg, Cu, Al-Mn, Al-Sc, Al-Yb, Al-Tb and Al-Zr master alloys and preheat and dry them in an oven at 240°C for 2 hours.

[0029] ② Melting Al: put the above-mentioned preheated Al into the crucible and melt it.

[0030] ③ Add Zn, Mg, Cu: After Al is completely melted and the temperature rises to about 740°C, add Zn, Mg, Cu and keep it warm for 10 minutes;

[0031] ④Add Al-Mn, Al-Sc, Al-Yb, Al-Tb: After step ③ is completed, the temperature rises to about 800°C, and Al-Mn, Al-Sc, Al-Yb, Al-Tb intermediate alloys are added, Stir for 4 minutes, then keep warm for 20 minutes;

[0032] ⑤ Add Al-Zr: After step ④ is completed, the temperature rises to abo...

Embodiment 2

[0041] A high-performance aluminum alloy suitable for cold forming, the mass percentage of each component is: 6wt.% Zn, 0.2wt.% Mg, 0.2wt.% Mn, 3wt.% Cu, 0.1wt.% Sc, 0.1wt.% Yb, 0.1wt.% Tb, 2wt.% Zr, the balance being Al.

[0042] First alloy melting, including the following steps:

[0043] ①Baking materials: Take pure Al, Zn, Mg, Cu, Al-Mn, Al-Sc, Al-Yb, Al-Tb and Al-Zr master alloys and preheat and dry them in an oven at 160°C for 3 hours.

[0044] ② Melting Al: put the above-mentioned preheated Al into the crucible and melt it.

[0045] ③ Add Zn, Mg, Cu: After Al is completely melted and the temperature rises to about 700°C, add Zn, Mg, Cu and keep it warm for 20 minutes;

[0046] ④Add Al-Mn, Al-Sc, Al-Yb, Al-Tb: After step ③ is completed, the temperature rises to about 740°C, and Al-Mn, Al-Sc, Al-Yb, Al-Tb intermediate alloys are added, Stir for 10 minutes, then keep warm for 10 minutes;

[0047] ⑤ Add Al-Zr: After step ④ is completed, the temperature rises to about 760°...

Embodiment 3

[0056] A high-performance aluminum alloy suitable for cold forming, the mass percentage of each component is: 4wt.% Zn, 3wt.% Mg, 1.5wt.% Mn, 1.5wt.% Cu, 1wt.% Sc, 1 wt.% of Yb, 0.5 wt.% of Tb, 1 wt.% of Zr, the balance being Al.

[0057] First alloy melting, including the following steps:

[0058] ① Baking materials: Take pure Al, Zn, Mg, Cu, Al-Mn, Al-Sc, Al-Yb, Al-Tb and Al-Zr master alloys and preheat and dry them in an oven at 200°C for 2.5 hours.

[0059] ② Melting Al: put the above-mentioned preheated Al into the crucible and melt it.

[0060] ③ Add Zn, Mg, Cu: After Al is completely melted and the temperature rises to about 720°C, add Zn, Mg, Cu and keep it warm for 15 minutes;

[0061] ④ Add Al-Mn, Al-Sc, Al-Yb, Al-Tb: After step ③ is completed, the temperature rises to about 770°C, and Al-Mn, Al-Sc, Al-Yb, Al-Tb intermediate alloys are added, Stir for 7 minutes, then keep warm for 15 minutes;

[0062] ⑤ Add Al-Zr: After step ④ is completed, the temperature rises ...

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Abstract

The invention discloses an aluminum alloy suitable for cold forming and a preparation method thereof. The aluminum alloy comprises, by mass, 2-6 wt.% of Zn, 0.2-6 wt.% of Mg, 0.2-3 wt.% of Mn, 0.2-3 wt.% of Cu, 0.1-2 wt.% of Sc, 0.1-2 wt.% of Yb, 0.1-1 wt.% of Tb, 0.2-2 wt.% of Zr, and the balance Al. The preparation method of the aluminum alloy comprises the four steps of smelting, homogenizationtreatment, cold forming and aging treatment. According to the aluminum alloy suitable for cold forming and the preparation method thereof, Zn, Mg, Mn, Cu, Yb and Tb elements are added to the aluminumalloy, a ZnYb strengthening phase, and a ZnTb strengthening phase and a MgZn strengthening phase are introduced to the aluminum alloy structure; grain refinement is conducted through Sc and Zr; through subsequent homogenization treatment, more than 60% of deformation of the homogenized aluminum alloy is realized without cracking; and finally, the homogenized aluminum alloy is subjected to cold plasticity deformation and aging treatment, and the high-performance aluminum alloy suitable for cold forming is prepared.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to an aluminum alloy and a preparation method thereof, in particular to an aluminum alloy suitable for cold forming and a preparation method thereof. Background technique [0002] Aluminum is currently the non-ferrous metal material with the largest output and the widest application range in the world. Its consumption is second only to steel. It is widely used in machinery, transportation, chemical industry, electric power, electronics, construction and other fields. With the development of science and technology, various fields have put forward higher requirements for the structure and performance of aluminum alloys. [0003] For traditional Al-Zn-Mg-Cu alloys (such as 7 series aluminum alloys), this alloy has high strength, small specific gravity, good machinability and good heat treatment effect, and is widely used in the aerospace industry and various in civilian products...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C21/06C22C21/10C22F1/047C22F1/053
CPCC22C1/026C22C1/03C22C21/06C22C21/10C22F1/047C22F1/053
Inventor 李军正刘文才
Owner 上海纳特汽车标准件有限公司
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