Enhanced corrosion resistance and hardness of CoCrCuFeNi alloy under high-pressure solidification

被引：7
作者：
Wang, Xiaohong [1 ]
Tao, Yanbo [1 ]
Yang, Xing [1 ]
Deng, Yulei [1 ]
Zhu, Dongdong [1 ]
Dong, Duo [1 ]
Ma, Tengfei [1 ]
机构：
[1] Quzhou Univ, Key Lab Air Driven Equipment Technol Zhejiang Prov, Quzhou 324000, Peoples R China
来源：
INTERMETALLICS | 2023年 / 154卷
基金：
中国国家自然科学基金;
关键词：
High-entropy alloys; Electron microscopy transmission; Nanoindentation; Mechanical properties; Electrochemistry; HIGH-ENTROPY ALLOY; MICROSTRUCTURAL EVOLUTION; STRENGTHENING MECHANISM; SEGREGATION;
D O I：
10.1016/j.intermet.2022.107778
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
This study adopts a high-pressure method to prepare a CoCrCuFeNi high-entropy alloy (HEA). The effects of high pressure on the microstructure, phase composition, hardness, and corrosion resistance of the alloy are studied. The Vickers hardness of the CoCrCuFeNi HEA solidified under ambient pressure and 4 GPa is determined to be 203.4 HV and 822.4 HV, respectively. This presents an approximately three-fold increase in hardness. The nanohardness of the matrix is also increased three-fold, and the value of the intergranular phase is increased by 0.2 times, which is attributed to the precipitation of a finer nano Cu-rich phase and nano Fe-Cr phase under high pressure. A more complete, dense, and uniform CoCrCuFeNi HEA passive film is obtained under high pressure, and the passivation film resistance (Rpass) is increased by 1.3 times. From a polarization curve test, the corrosion rates of the CoCrCuFeNi HEA solidified under ambient pressure and 4 GPa are 0.0209 mm/a and 0.0076 mm/a, respectively. Thus, the corrosion rate is reduced by 64%.
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页数：9
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