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Two-stage aging process of Al-Zn-Mg-Cu-Zr-Er alloy

A dual-stage aging and process technology, applied in the field of non-ferrous metals, can solve the problems of poor corrosion, low toughness of high-strength aluminum alloys, etc.

Active Publication Date: 2013-04-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of high-strength aluminum alloys is often limited due to its low toughness and poor corrosion resistance. It is an important research topic to improve the toughness and corrosion resistance of Al-Zn-Mg-Cu alloys under the condition of ensuring their high strength.

Method used

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  • Two-stage aging process of Al-Zn-Mg-Cu-Zr-Er alloy
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  • Two-stage aging process of Al-Zn-Mg-Cu-Zr-Er alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1) For the mass percentage content: Zn5.6%, Mg2.6%, Cu1.5%, Zr0.2%, Er0.2%, Mn0.15%, a small amount of impurities Fe, Si, the balance is Al The alloy was solution treated at 470℃ / 2h, and then quenched in water at room temperature;

[0015] 2) For the Al-Zn-Mg-Cu-Zr-Er alloy obtained in step 1), carry out the 9 sets of double-stage aging orthogonal tests shown in Table 1, according to the "Metallic Materials Tensile Test Method at Room Temperature" (GB / T228- 2002) for tensile performance test, the data are listed in Table 1. The exfoliation corrosion test was carried out according to the "Exfoliation Corrosion Test Method for Aluminum Alloy Processed Products" (GB / T22639-2008), and the exfoliation corrosion grades are listed in Table 1.

[0016] Table 1 Orthogonal design test scheme and test results

[0017]

[0018] The results of the double-stage aging orthogonal test in Table 1 were analyzed using the comprehensive balance method, and it was predicted that the Al...

Embodiment 2

[0020] 1) For the mass percentage content: Zn5.6%, Mg2.6%, Cu1.5%, Zr0.2%, Er0.2%, Mn0.15%, a small amount of impurities Fe, Si, the balance is Al The alloy was solution treated at 470℃ / 2h, and then quenched in water at room temperature;

[0021] 2) After the Al-Zn-Mg-Cu-Zr-Er alloy obtained in step 1) is subjected to a double-stage aging treatment at 105°C×5h+170°C×12h, according to the "Metallic Materials Tensile Test Method at Room Temperature" (GB / T228-2002) for tensile test, the data are listed in Table 2. The exfoliation corrosion test was carried out according to the "Exfoliation Corrosion Test Method for Aluminum Alloy Processed Products" (GB / T22639-2008), and the exfoliation corrosion grades are listed in Table 2.

[0022] Table 2105℃×5h+170℃×12h double-stage aging test test results

[0023]

[0024] The test results show that the Al-5.6Zn-2.6Mg-1.5Cu-0.2Zr-0.2Er alloy has good mechanical properties and exfoliation corrosion properties after double-stage aging t...

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Abstract

The invention relates to a two-stage aging process of an Al-Zn-Mg-Cu-Zr-Er alloy and belongs to the technical field of non-ferrous metal. The two-stage aging process comprises the steps of: carrying out solution treatment on an Al-5.6Zn-2.6Mg-1.5Cu-0.2Zr-0.2Er alloy at 470 DEG C for 2 hours, and then quenching in water; and carrying out two-stage aging heat treatment, wherein first-stage aging heat treatment is carried out at 105-135 DEG C for 5-7 hours, and second-stage aging heat treatment is carried out at 150-170 DEG C for 12-18 hours. The obtained alloy has high hardness and toughness and good exfoliation corrosion performance.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metals, and in particular relates to a double-stage aging process for Al-Zn-Mg-Cu-Zr-Er alloys. Background technique [0002] The literature survey results show that aluminum alloys are widely used in aviation, aerospace, transportation industries, machinery, electronics, construction and household due to their low density, high specific strength, good toughness and good corrosion resistance. Electrical appliances and other fields play an irreplaceable and important role in the national economy and national defense construction. Al-Zn-Mg-Cu series (7xxx series) alloys are typical representatives of high-strength wrought aluminum alloys, and are lightweight structural materials with great application prospects in aerospace and military fields. However, the application of high-strength aluminum alloys is often limited due to their low toughness and poor corrosion resistance. It is an important r...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22F1/053
Inventor 聂祚仁王慧美黄晖王为文胜平高坤元
Owner BEIJING UNIV OF TECH
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