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Al-Mg-Zn-Cu alloy and preparation method thereof

An alloy and intermediate alloy technology, applied in the field of alloys, can solve the problems of affecting surface quality, strength and dent resistance, unable to meet the requirements of body panels, poor impact resistance, etc.

Active Publication Date: 2013-08-21
ZHEJIANG GKO IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the 5XXX series aluminum alloys used for automobile body panels belong to non-heat-treatable strengthening alloys, and their strength is slightly insufficient and their impact resistance is poor; the 5XXX series aluminum alloys produced in the prior art not only cannot meet the requirements of body panels in terms of strength and dent resistance , and a series of new steps or jagged deformation bands on the surface of the product are usually produced during the deep drawing process, which seriously affects the surface quality and softens after baking, which makes it unfavorable to be used as an alloy for automobile body panels

Method used

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  • Al-Mg-Zn-Cu alloy and preparation method thereof
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  • Al-Mg-Zn-Cu alloy and preparation method thereof

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preparation example Construction

[0062] The invention provides a kind of preparation method of Al-Mg-Zn-Cu alloy, comprises the following steps:

[0063] a) Melting and casting the components contained in the alloy described in the above technical solution to obtain an ingot;

[0064] b) performing homogenization treatment, hot rolling, annealing, cold rolling and solution quenching treatment on the ingot in sequence;

[0065] c) leveling the aluminum alloy plate after the solution quenching treatment in step b);

[0066] d) heat-treating the aluminum alloy plate after the leveling treatment in step c), and obtain an Al-Mg-Zn-Cu alloy plate for automobile body after cooling.

[0067] The present invention melts and casts the components described in the above technical solution to obtain an ingot. In the present invention, the process of melting and casting preferably includes the following steps:

[0068] After melting the aluminum ingot, add AlCu50, AlMn10 master alloy, Zn and covering agent when the melt ...

Embodiment 1

[0088] Al-Mg-Zn-Cu alloys were prepared from various raw materials according to the composition of the alloys in Table 1.

[0089] First put the aluminum ingot into the melting furnace. When the aluminum ingot is melted and the melt temperature is 730°C, add AlCu50, AlMn10 master alloy and Zn to the obtained aluminum melt and add a small amount of covering agent. When the master alloy is completely melted, continue Stir the Al-Cu-Mn-Zn mixed melt; when the temperature of the Al-Cu-Mn-Zn mixed melt drops to 710°C, add Mg to the obtained Al-Cu-Mn-Zn mixed melt, and fully Stirring; then slagging, degassing and refining to obtain Al-Cu-Mn-Zn-Mg mixed melt; when the temperature is at 720°C, add Al-Cu-Mn-Zn-Mg mixed melt 5Ti-B master alloy, stirring and standing for 10 minutes, casting in an iron mold to obtain an ingot;

[0090] The ingot obtained is heated up to 460 DEG C of insulation 16h with furnace and carries out homogenization treatment;

[0091] The homogenized ingot is c...

Embodiment 2～4

[0102] According to the technical solution of Example 1, the components of Examples 2-4 listed in Table 1 were prepared to obtain finished aluminum alloys.

[0103] In the present invention, the obtained aluminum alloy is tested for mechanical properties and formability, and the results are shown in Table 2. Table 2 is the performance test results of the aluminum alloys obtained in the embodiments of the present invention and comparative examples;

[0104] The present invention carries out simulated baking paint test with the aluminum alloy finished product that obtains, and concrete process is as follows:

[0105] The sample is pre-stretched by 2%, then heated at 170° C. for 20 minutes, taken out, and subjected to a tensile test at room temperature after air-cooling. The results are shown in Table 2. Table 2 shows the performance of the aluminum alloys obtained in the embodiments of the present invention and comparative examples Test Results.

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Abstract

The invention provides an Al-Mg-Zn-Cu alloy. The Al-Mg-Zn-Cu alloy comprises the following compositions in percentage by weight (wt%): 3.5-5.3% of Mg, 0.05-0.28% of Cu, 0.50-2.0% of Zn, 0.10-0.50% of Mn, 0.01-0.10% of Ti, less than or equal to 0.10% of Cr, less than or equal to 0.20% of Si, less than or equal to 0.30% of Fe, and the balance of Al and inevitable impurities. According to the Al-Mg-Zn-Cu alloy, the alloy has better firing and softening resistance property and forming property while the strength of the alloy is improved through Mg, Cu and Zn. Therefore, the Al-Mg-Zn-Cu alloy provided by the invention can meet the requirement of an automobile body on the strength and impact resistance when being used for an automobile body board, and has good in firing and forming properties.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to an Al-Mg-Zn-Cu alloy and a preparation method thereof. Background technique [0002] The world's auto industry is facing three increasingly severe issues: energy, environmental protection, and safety. Reducing the weight of automobiles, reducing energy consumption, reducing environmental pollution, improving fuel economy of automobiles, and saving limited resources have become the focus of major automobile factories. [0003] Aluminum alloy has a series of excellent characteristics such as high specific strength, good corrosion resistance, good impact resistance, easy surface coloring, good processing formability, and high recycling and regeneration, making it an excellent choice for lightweight automobiles. The preferred material, with excellent properties unmatched by other alloys. [0004] Since the car body accounts for about 30% of the total vehicle weight, aluminum alloy i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/06C22C1/02C22F1/047
Inventor 朱其柱丁荣辉茅海波齐基张超
Owner ZHEJIANG GKO IND CO LTD
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