时效温度和时间对新型Al-6Zn-1.1Mg合金组织性能的影响

doi:10.11896/j.issn.1005-023X.2018.24.015

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Abstract The effects of aging temperature and duration on the microstructure evolution and properties of the new Al-6Zn-1.1Mg alloy were determined and investigated by using hardness tester, transmission electron microscope (TEM), tensile tester and conductivity tester. The results indicated that with the increase of aging duration, the GP zone, η′ phase (metastable MgZn₂) and η phase (stable MgZn₂) precipitate in turn from the Al-6Zn-1.1Mg alloy. The GP zone and η′ phase can hinder the movement of dislocations and consequently strengthen the alloy. When the number of GP zone reaches the maximum, the first peak values of alloy’s strength and hardness can be obtained. And the transformation of GP zone into η′ phase causes the alloy’s strength and hardness to reach the second peak values. Moreover, while the η′ phase is transformed into η phase, the strength and hardness of the alloy begin to decline. With the increase of aging temperature, the precipitations of GP zone, η′ phase and η phase are gradually accelerated, resulting in less time consumptions of the alloy’s strength and hardness to reach both of the first and second peaks, as well as shorter time interval between the two peaks. In addition, we also observed the higher second peak values (compared with the first peak va-lues) of strength and hardness at an aging temperature of 120 ℃, and the higher first peak values (compared with the second peak values) of strength and hardness at aging temperatures higher than 120 ℃.

Key words： mobile casing 7xxx aluminum alloy Al-Zn-Mg alloy aging strengthening conductivity

Published: 23 January 2019

CLC number:

TG146.21

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	Articles by authors
	LIU Lei
	ZHOU Haitao
	ZHOU Nan
	NONG Deng
	WANG Shuncheng

Cite this article:

LIU Lei,ZHOU Haitao,ZHOU Nan, et al. Aging Duration Dependence and Aging Temperature Dependence of Microstructure and Properties of Al-6Zn-1.1Mg Alloy[J]. Materials Reports, 2018, 32(24): 4292-4296.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.24.015 OR http://www.mater-rep.com/EN/Y2018/V32/I24/4292

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