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

Article dans une revue avec comité de lecture
Auteur
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

Résumé

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.

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