Intergranular precipitation-enhanced wetting and phase transformation in an Al0.4CoCrFeNi high-entropy alloy exposed to lead-bismuth eutectic
Journal Article
·
· Corrosion Science
- Shenzhen University (China); OSTI
- Hautes Écoles Sorbonne Arts et Métiers University (HESAM), Paris (France)
- Shenzhen University (China)
- 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 Al0.4CoCrFeNi high-entropy alloy (HEA) decorated 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.
- Research Organization:
- Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China; USDOE Office of Nuclear Energy (NE); USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)
- Grant/Contract Number:
- NE0008871
- OSTI ID:
- 1977035
- Alternate ID(s):
- OSTI ID: 1866279
- Journal Information:
- Corrosion Science, Journal Name: Corrosion Science Journal Issue: C Vol. 196; ISSN 0010-938X
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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