Effect of Al content on the corrosion behavior and mechanism of AlxCoCrFeNi high-entropy alloys

被引:10
作者
Wang, Yi [1 ,2 ]
Li, Guanglong [1 ,2 ]
Qi, Hao [1 ,2 ]
Zhang, Wei [1 ,2 ]
Chen, Ruirun [3 ]
Su, Ruiming [1 ,2 ]
Qu, Yingdong [1 ,2 ]
机构
[1] Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang 110870, Peoples R China
[2] Key Lab Light Met Mat & Engn Univ Liaoning Prov, Shenyang 110870, Peoples R China
[3] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
来源
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2024年 / 30卷
关键词
High-entropy alloy; AlCoCrFeNi; Passivation film; Crystal structure; Corrosion resistance; Corrosion mechanism; 316L STAINLESS-STEEL; 3.5 WT.PERCENT NACL; MICROSTRUCTURE; RESISTANCE; EVOLUTION;
D O I
10.1016/j.jmrt.2024.04.238
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Al addition is known to improve the tensile strength and high-temperature oxidation behavior of the Al x CoCr- FeNi high-entropy alloy (HEA). However, the corrosion behavior and mechanisms associated with these HEAs remain unclear. The corrosion resistance of structural materials is as important as their mechanical properties. In this study, Al x CoCrFeNi HEAs with different molar ratios of Al (x = 0.0, 0.5, 1.0, and 1.5) and various crystal structures (FCC, FCC + BCC, and BCC phases) were prepared, and their corrosion behavior and mechanisms were studied, which revealed a competitive relationship between the Al and Cr passivation films. The thickness of the Al passivation film increased with increasing Al content, which was found to be the main reason for the decrease in the corrosion resistance of the Al x CoCrFeNi HEAs. The corrosion type of the Al x CoCrFeNi HEA changed from pitting corrosion to selective corrosion with increasing Al content, and the corroded elements changed from (Co, Cr, Fe, and Ni) to (Al and Ni) and then (Al, Ni, and Co). Accordingly, the corrosion mechanisms associated with the Al x CoCrFeNi HEAs were elucidated.
引用
收藏
页码:5977 / 5989
页数:13
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