Liquid metal embrittlement of a dual-phase Al0.7CoCrFeNi high-entropy alloy exposed to oxygen-saturated lead-bismuth eutectic
Name
SSRN-id3711237.pdf
Description
Submitted version
Size
5.39 MB
Format
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Checksum (MD5)
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Author(s)
Gong, Xing
Xiang, Congying
Auger, Thierry
Chen, Jiajun
Liang, Xiaocong
Yu, Zhiyang
Short, Michael P
Song, Min
Yin, Yuan
Date Issued
2021
Journal
Scripta Materialia
Publisher
Elsevier BV
Version
Original manuscript
Abstract
© 2020 This paper reports a new liquid metal embrittlement (LME) system in which a dual-phase Al0.7CoCrFeNi (equimolar fraction) high-entropy alloy (HEA) is embrittled by lead-bismuth eutectic (LBE) at 350 and 500°C. At 350°C, (Ni, Al)-rich BCC phase is embrittled, leading to intragrain cracking within this phase, while the predominant cracking mode changes to BCC/FCC phase boundary decohesion at 500°C. At both temperatures, cracks are rarely seen in the (Co, Cr, Fe)-rich FCC phase, indicating that this phase is immune to LME. Furthermore, the results suggest a transition from an adsorption-dominated LME mechanism at 350°C to a phase boundary wetting-dominated LME mechanism at 500°C.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/J.SCRIPTAMAT.2020.113652
