Preparation method of Al-Zn-Mg alloy

An alloy and alloy casting technology, which is applied in the field of aluminum alloys, can solve problems such as unreasonable temperature design, excessive extrusion ratio design, and intensified natural aging strengthening, and achieve low natural aging strengthening ability, good bending and forming performance, and good room temperature The effect of mechanical properties

Active Publication Date: 2020-07-28
TAISHAN CITY KAM KIU ALUMINUM EXTRUSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The chemical composition design of Al-Zn-Mg (7003 / 7108) material is not reasonable enough;
[0005] 2. The temperature design of homogenization is not reasonable enough, and single-stage homogenization treatment is mostly used (gradient control cannot be achieved if the furnace is heated up too much);
[0006] 3. The extrusion temperature design is not very reasonable;
[0007] 4. The extrusion speed design is not reasonable enough;
[0008] 5. The extrusion ratio is too large;
[0009] 6. The cooling rate design is not reasonable enough;
[0010] 7. After the profile comes out, it is parked without any treatment, and the natural aging strengthening will intensify faster

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of Al-Zn-Mg alloy, its composition includes by weight percentage: Si 0.12%, Fe0.12%, Cu 0.15%, Mn 0.03%, Mg 0.7%, Zn 5.5%, Zr 0.15%, Ti 0.08 %, the rest is Al and unavoidable impurities;

[0039] Specifically include the following steps:

[0040] 1. Melting: Melting the material of the Al-Zn-Mg alloy to ensure that each component diffuses fully and uniformly to each part of the solution.

[0041] In the smelting part of this embodiment, electromagnetic stirring is used to make the alloy diffuse evenly in the melt; the temperature of the melt during the smelting process is controlled at no more than 800° C., and the smelting time does not exceed 5 hours.

[0042] 2. Casting: S2. Casting: casting the above solution into an alloy casting body.

[0043] In this embodiment, the casting temperature is controlled between 710-730°C, the mold plate temperature is controlled between 680-700°C, and the cooling water pressure is controlled between 0.02Mpa-0.0...

Embodiment 2

[0057] A kind of preparation method of Al-Zn-Mg alloy, its specific preparation steps are identical with embodiment 1, difference is that its composition comprises by weight percentage: Si 0.18%, Fe 0.18%, Cu 0.25%, Mn 0.1%, Mg 1.5%, Zn 6.0%, Zr 0.25%, Ti 0.2%, the rest is Al and unavoidable impurities.

Embodiment 3

[0059] A kind of preparation method of Al-Zn-Mg alloy, its concrete preparation steps are identical with embodiment 1, difference is that its composition comprises by weight percentage: Si 0.15%, Fe 0.14%, Cu 0.19%, Mn 0.06%, Mg 0.9%, Zn 5.58%, Zr 0.18%, Ti 0.11%, the rest is Al and unavoidable impurities.

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Abstract

The invention relates to a preparation method of an Al-Zn-Mg alloy. The preparation method of the Al-Zn-Mg alloy comprises the following components of, in percentage by weight, 0.12%-0.18% of Si, 0.12%-0.18% of Fe, 0.15%-0.25% of Cu, 0.03%-0.1% of Mn, 0.7%-1.5% of Mg, 5.5%-6.0% of Zn, 0.15%-0.25% of Zr, 0.08%-0.2% of Ti, and the balance Al and inevitable impurities; and the preparation method comprises the specific preparation steps of smelting, casting, homogenizing annealing, extrusion, cooling, pretreatment and subsequent treatment. The Al-Zn-Mg alloy material prepared through the method has a smaller recrystallization structure, higher strength, better corrosion resistance, better room-temperature mechanical performance, better bending forming performance, better welding performance and the like, and industrial batch production of Al-Zn-Mg alloy bumper profiles can be achieved.

Description

technical field [0001] The invention relates to the field of aluminum alloys, in particular to a preparation method of an Al-Zn-Mg alloy. Background technique [0002] Al-Zn-Mg (7003 / 7108 / 7039 / 7005) aluminum alloy cast rods are widely used in high-speed rail and automobile fields due to their high mechanical properties, welding properties and corrosion resistance. The production of such aluminum alloy profiles generally includes smelting, casting, homogenizing annealing, extrusion, cooling, stretching, natural parking, stamping and bending, welding, artificial aging, etc. [0003] Existing process technology in casting extrusion and later parking and bending forming stages: [0004] 1. The chemical composition design of Al-Zn-Mg (7003 / 7108) material is not reasonable enough; [0005] 2. The temperature design of homogenization is not reasonable enough, and single-stage homogenization treatment is mostly used (gradient control cannot be achieved if the furnace is heated up ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C21/10C22F1/053
CPCC22C1/026C22C21/10C22F1/053
Inventor 郭辉范世通蓝艳全林耿江黄来福张毅李干希刘智杰杨翠颜徐悦叶建宏
Owner TAISHAN CITY KAM KIU ALUMINUM EXTRUSION
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