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Thermal treatment process for improving high-strength aluminum alloy anti-stress corrosion performance

A corrosion performance, aluminum alloy technology, applied in the field of heat treatment technology, can solve the problems of high strength and poor stress corrosion resistance of aluminum alloys, and achieve good stress corrosion resistance, high strength, and improved stress corrosion resistance.

Active Publication Date: 2009-05-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the Al-Zn-Mg-Cu series aluminum alloy has high strength and poor stress corrosion resistance. With high strength, it has good stress corrosion resistance

Method used

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  • Thermal treatment process for improving high-strength aluminum alloy anti-stress corrosion performance
  • Thermal treatment process for improving high-strength aluminum alloy anti-stress corrosion performance
  • Thermal treatment process for improving high-strength aluminum alloy anti-stress corrosion performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Taking the hot-rolled 6mm thick 7050 plate as an example, the chemical composition (mass fraction, %) is Zn 6.18, Mg2.20, Cu 2.21, Zr 0.13, Si 0.11, Fe 0.10, and the balance of Al.

[0032] 1. Solution treatment: 7050 alloy is subjected to solution treatment, and the process parameters of solution treatment are 450°C, 120min.

[0033] 2. One-time quenching: Perform one-time quenching treatment on the alloy after solid solution treatment, that is, quench it with room temperature water to room temperature.

[0034] 3. Pre-stretching: After quenching, the alloy is pre-stretched and deformed by 3% in 2 hours, and dislocations are introduced into the alloy.

[0035] 4. Short-time aging at high temperature: aging the pre-stretched alloy at 200°C for 0.5min.

[0036] 5. Secondary quenching treatment: the alloy after high-temperature short-time aging treatment is quenched to room temperature with water at room temperature.

[0037] 6. Low-temperature aging: aging the alloy af...

Embodiment 2

[0039] Taking the hot-rolled 6mm thick 7050 plate as an example, the chemical composition (mass fraction, %) is Zn 6.18, Mg2.20, Cu 2.21, Zr 0.13, Si 0.11, Fe 0.10, and the balance of Al.

[0040] 1. Solution treatment: 7050 alloy is subjected to solution treatment, and the process parameters of solution treatment are 460°C, 90min.

[0041] 2. One-time quenching: Perform one-time quenching treatment on the alloy after solid solution treatment, that is, quench it with room temperature water to room temperature.

[0042] 3. Pre-stretching: After quenching, the alloy is pre-stretched and deformed by 5% in 3 hours, and dislocations are introduced into the alloy.

[0043] 4. Short-time aging at high temperature: aging the pre-stretched alloy at 220°C for 2.5 minutes.

[0044] 5. Secondary quenching treatment: the alloy after high-temperature short-time aging treatment is quenched to room temperature with water at room temperature, and then cooled.

[0045] 6. Low-temperature agin...

Embodiment 3

[0047] Taking the hot-rolled 6mm thick 7050 plate as an example, the chemical composition (mass fraction, %) is Zn 6.18, Mg2.20, Cu 2.21, Zr 0.13, Si 0.11, Fe 0.10, and the balance of Al.

[0048] 1. Solution treatment: 7050 alloy is subjected to solution treatment, and the process parameters of solution treatment are 470°C, 30min.

[0049] 2. One-time quenching: Perform one-time quenching treatment on the alloy after solid solution treatment, that is, quench it with room temperature water to room temperature.

[0050] 3. Pre-stretching: After quenching, the alloy is pre-stretched and deformed by 10% at 2 hours to introduce dislocations into the alloy.

[0051] 4. Short-term aging at high temperature: aging the pre-stretched alloy at 230°C for 5 minutes.

[0052] 5. Secondary quenching treatment: the alloy after high-temperature short-time aging treatment is quenched to room temperature with water at room temperature.

[0053] 6. Low-temperature aging: the alloy after the se...

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Abstract

The invention relates to a heat treatment process for improving the stress corrosion resistance of a high-strength aluminum alloy, which comprises the following treatments on a heat-treatable high-strength aluminum alloy sequentially: solution treatment, primary quenching treatment, pre-stretching treatment, high-temperature and short-time aging treatment, secondary quenching treatment, and low-temperature aging treatment. The alloy treated by the process can achieve adequate strength and good stress corrosion resistance.

Description

technical field [0001] The invention relates to a heat treatment process of a high-strength aluminum alloy, which improves the stress corrosion resistance of the alloy without obviously reducing the strength of the alloy. Background technique [0002] Al-Zn-Mg-Cu series aluminum alloy is a high-strength wrought aluminum alloy with high specific strength and hardness. It is one of the important structural materials in aviation, aerospace, weapons, transportation and other industries. However, this series of aluminum alloys has obvious stress corrosion phenomenon in the peak strength aging state, which restricts the wide industrial application of this series of alloys. Therefore, improving the stress corrosion resistance of alloys while maintaining high strength has become a difficult point for this series of alloys. [0003] For Al-Zn-Mg-Cu aluminum alloys, it is generally believed that its stress corrosion performance is related to the grain boundary precipitated phase and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
Inventor 王东马宗义
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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