Aging treatment process of Al-Zn-Mg-Cu aluminum alloy

A technology of aging treatment and aluminum alloy, which is applied in the field of aluminum alloy heat treatment, can solve the problems of limited corrosion resistance improvement, limited regression time, and inability to achieve strength and corrosion resistance, and achieve the effect of improving corrosion resistance and high strength

Active Publication Date: 2010-08-04
湖南中创空天新材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limited regression time, the grain boundary precipitates cannot fully grow and separate, and the improvement of corrosion resistance is limited.
In regression reaging, if the regression time is extended, a large amount of equilibrium phases will be precipitated in the grain, which will reduce the hardening effect of reaging, and it will not be possible to further improve corrosion resistance while maintaining strength

Method used

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  • Aging treatment process of Al-Zn-Mg-Cu aluminum alloy
  • Aging treatment process of Al-Zn-Mg-Cu aluminum alloy
  • Aging treatment process of Al-Zn-Mg-Cu aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] After the sample was subjected to regression and re-aging according to Comparative Example 2, the second regression and re-aging was performed at 170°C / 5min→120°C / 24h. Hardness and electrical conductivity tests were carried out after aging, and the experimental results were as follows: figure 2 shown. Exfoliation corrosion grade evaluation, the evaluation results are as follows image 3 shown.

Embodiment 2

[0024] After the sample was subjected to regression and re-aging according to Comparative Example 2, the second regression and re-aging was performed at 170°C / 30min→120°C / 24h. Hardness and electrical conductivity tests were carried out after aging, and the experimental results were as follows: figure 2 shown. Exfoliation corrosion grade evaluation, the evaluation results are as follows image 3 shown.

Embodiment 3

[0026] After the sample was subjected to regression and re-aging according to Comparative Example 2, the second regression and re-aging was performed at 200°C / 5min→120°C / 24h. Hardness and electrical conductivity tests were carried out after aging, and the experimental results were as follows: figure 2 shown. Exfoliation corrosion grade evaluation, the evaluation results are as follows image 3 shown.

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Abstract

The invention discloses an aging treatment process of an Al-Zn-Mg-Cu aluminum alloy, which comprises: keeping an aging temperature of 120 DEG C for 24 hours and a regression temperature of 170 to 200 DEG C for 5 to 30 minutes; after the regression, quenching the alloy or cooling the alloy with furnace to an reaging temperature and keeping the reaging temperature of 120 DEG C for 24 hours; and after primary regression and reaging, performing one or more times of regression and reaging. Aiming at the drawbacks of the traditional Al-Zn-Mg-Cu alloy peak aging, overaging and primary regression and reaging heat treatment technology, the invention provides a novel aging treatment method on the basis of a discovery that in the secondary regression after the primary regression and reaging of the Al-Zn-Mg-Cu alloy, a grain boundary precipitate phase can continue to grow and disperse while the intra-grain precipitate phase can dissolve in a matrix again to ensure the alloy can precipitate till a peak aging state in consequent reaging. The treatment method can improve the corrosion resistance of the Al-Zn-Mg-Cu alloy considerably on the premise of retaining the strength of the Al-Zn-Mg-Cu alloy.

Description

technical field [0001] The invention belongs to an aluminum alloy heat treatment method, in particular to an aging treatment process for an Al-Zn-Mg-Cu series aluminum alloy. Background technique [0002] The Al-Zn-Mg-Cu series aluminum alloy is a high-strength aluminum alloy that can be strengthened by heat treatment. The strength of the alloy can be improved by quenching and aging process, but the precipitates on the grain boundary are enriched and distributed continuously during the aging process, which reduces the strength of the alloy. toughness and corrosion resistance. In order to improve the toughness and corrosion resistance of alloys, people mainly use multi-stage aging process to adjust the distribution of precipitates in grains and grain boundaries. The dual-stage aging process of peak aging + overaging is adopted (Journal of Central South University (Natural Science Edition), 2007, Volume 38, No. 6, P1045), in which the first-stage aging is low-temperature pre-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C22F1/053
Inventor 陈康华彭国胜陈送义
Owner 湖南中创空天新材料股份有限公司
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