Intergranular precipitation-enhanced wetting and phase transformation in an Al0.4CoCrFeNi high-entropy alloy exposed to lead-bismuth eutectic

GONG, Xing; AUGER, Thierry; ZHU, Wenjian; LEI, Huasheng; XIANG, Congying; YU, Zhiyang; SHORT, Michael; WANG, Pei; YIN, Yuan

Article dans une revue avec comité de lecture

Author

GONG, Xing
242850 Shenzhen University [Shenzhen]

AUGER, Thierry
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

ZHU, Wenjian
242850 Shenzhen University [Shenzhen]

LEI, Huasheng
563161 Fuzhou University [Fuzhou]

XIANG, Congying
563161 Fuzhou University [Fuzhou]

YU, Zhiyang
563161 Fuzhou University [Fuzhou]

SHORT, Michael
301950 Massachusetts Institute of Technology [MIT]

WANG, Pei
242850 Shenzhen University [Shenzhen]

YIN, Yuan
242850 Shenzhen University [Shenzhen]

URI

http://hdl.handle.net/10985/22356

DOI

10.1016/j.corsci.2021.110038

Date

2021-12-23

Journal

Corrosion Science

Abstract

After exposure to oxygen-poor (10^-13–10^-14 wt%) liquid lead-bismuth eutectic (LBE) at 500°C for 500 h, LBE penetrates more than one order of magnitude deeper in an FCC Al0.4CoCrFeNi high-entropy alloy (HEA) deco-rated with a network of BCC (Ni, Al)-rich intergranular (IG) precipitates than in a single-phase, FCC Al0.3CoCrFeNi HEA without the IG precipitate network. This deterioration of corrosion resistance is attributed to the energetic nature of the BCC/FCC interphase boundaries (IBs) and resultant IB wetting. The LBE ingress ﬁlm selectively leaches nickel located at those low-indexed crystalline planes, resulting in phase transformation from FCC to BCC structure.