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 P.; Wang, Pei; Yin, Yuan

doi:10.1016/j.corsci.2021.110038

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

Journal Article · Wed Dec 22 00:00:00 EST 2021 · Corrosion Science

DOI:https://doi.org/10.1016/j.corsci.2021.110038· OSTI ID:1977035

Gong, Xing ^[1]; Auger, Thierry ^[2]; Zhu, Wenjian ^[1]; Lei, Huasheng ^[3]; Xiang, Congying ^[3]; Yu, Zhiyang ^[3]; Short, Michael P. ^[4]; Wang, Pei ^[1]; Yin, Yuan ^[1]

Shenzhen University (China)
Hautes Écoles Sorbonne Arts et Métiers University (HESAM), Paris (France)
Fuzhou University (China)
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)

We report 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 Al_0.4CoCrFeNi high-entropy alloy (HEA) decorated with a network of BCC (Ni, Al)-rich intergranular (IG) precipitates than in a single-phase, FCC Al_0.3CoCrFeNi 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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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP); National Natural Science Foundation of China (NSFC); USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: NE0008871; 51801129

OSTI ID:: 1977035

Alternate ID(s):: OSTI ID: 1866279

Journal Information:: Corrosion Science, Vol. 196, Issue C; ISSN 0010-938X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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