AlMgLi0.5Zn0.5Cu0.2轻质高熵合金的组织和耐腐蚀性研究

doi:10.11896/cldb.22010093

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Abstract AlMgLi_0.5Zn_0.5Cu_0.2 light-weight high-entropy alloy was fabricated by magnetic levitation melting with five light weight elements Al, Mg, Li, Cu and Zn. The effect of heat treatment on the microstructure of the AlMgLi_0.5Zn_0.5Cu_0.2 light-weight high-entropy alloy was analyzed by XRD and SEM. The density and corrosion resistance of the AlMgLi_0.5Zn_0.5Cu_0.2 light-weight high-entropy alloy were tested by ES-D electronic balance and CS350 electrochemical workstation, respectively. The results show that the density of the AlMgLi_0.5Zn_0.5Cu_0.2 light-weight high-entropy alloy is 2.851 g/cm³. The eutectic microstructure containing Mg₃₂(AlZn)₄₉ phase at the grain boundary of the AlMgLi_0.5Zn_0.5Cu_0.2 light-weight high-entropy alloy decreases and its morphology changes from strip to point after heat treatment. The dendrite microstructure of FCC1 phase becomes finer and more uniform. After the heat treatment at 300 ℃, the Cu element on the surface of FCC1 phase is solidly dissolved into the matrix, improving the corrosion resistance of the alloy. However, after the heat treatment at 300 ℃+120 ℃, FCC1 becomes equiaxed and FCC2 (Cu-rich phase) precipitates on the substrate surface of FCC1, forming a micro-corrosion battery, which reduces the corrosion resistance of the alloy.

Key words： light-weight high-entropy alloy AlMgLi_0.5Zn_0.5Cu_0.2 microstructure corrosition resistance

Published: Online: 2022-07-26

CLC number:

TB31

Fund:National Natural Science Foundation of China (51865011) and the Natural Science Foundation of Jiangxi Province (20212BAB204008).

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	Articles by authors
	HU Yong
	LIU Fei
	LIU Yuanyuan
	ZHAO Longzhi
	JIAO Haitao
	TANG Yanchuan
	LIU Dejia

Cite this article:

HU Yong,LIU Fei,LIU Yuanyuan, et al. Study on Microstructure and Corrosion Resistance of AlMgLi_0.5Zn_0.5Cu_0.2 Light-weight High-entropy Alloy[J]. Materials Reports, 2022, 36(14): 22010093-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22010093 OR http://www.mater-rep.com/EN/Y2022/V36/I14/22010093

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