Study on Microstructure and Corrosion Resistance of AlMgLi0.5Zn0.5Cu0.2 Light-weight High-entropy Alloy

被引：0
|
作者：
Hu Y. [1 ,2 ]
Liu F. [1 ,2 ]
Liu Y. [1 ,2 ]
Zhao L. [1 ,2 ]
Jiao H. [1 ,2 ]
Tang Y. [1 ,2 ]
Liu D. [1 ,2 ]
机构：
[1] School of Materials Science and Engineering, East China Jiaotong University, Nanchang
[2] Key Laboratory of Advanced Materials for Vehicles and Laser Additive Manufacturing of Nanchang City, Nanchang
来源：
Cailiao Daobao/Materials Reports | 2022年 / 36卷 / 14期
基金：
中国国家自然科学基金;
关键词：
AlMgLi[!sub]0.5[!/sub]Zn[!sub]0.5[!/sub]Cu[!sub]0.2[!/sub; corrosition resistance; light-weight high-entropy alloy; microstructure;
D O I：
10.11896/cldb.22010093
中图分类号：
学科分类号：
摘要：
AlMgLi0.5 Zn0.5 Cu0.2 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 AlMgLi0.5 Zn0.5 Cu0.2 light-weight high-entropy alloy was analyzed by XRD and SEM. The density and corrosion resistance of the AlMgLi0.5 Zn0.5 Cu0.2 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 AlMgLi0.5 Zn0.5 Cu0.2 light-weight high-entropy alloy is 2.851 g/cm3. The eutectic microstructure containing Mg32(AlZn)49 phase at the grain boundary of the AlMgLi0.5 Zn0.5 Cu0.2 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 oC, 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 oC+120 oC, 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. © 2022 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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