Liquid metal embrittlement of a dual-phase Al0.7CoCrFeNi high-entropy alloy exposed to oxygen-saturated lead-bismuth eutectic

Article dans une revue avec comité de lecture
Auteur
GONG, Xing
242850 Shenzhen University [Shenzhen]
XIANG, Congying
563161 Fuzhou University [Fuzhou]
AUGER, Thierry
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
CHEN, Jiajun
242850 Shenzhen University [Shenzhen]
LIANG, Xiaocong
563161 Fuzhou University [Fuzhou]
YU, Zhiyang
563161 Fuzhou University [Fuzhou]
SHORT, Michael P
301950 Massachusetts Institute of Technology [MIT]
SONG, Min
465414 Central South University [Changsha]
YIN, Yuan
242850 Shenzhen University [Shenzhen]

URI
http://hdl.handle.net/10985/20459
DOI
10.1016/j.scriptamat.2020.113652
Date
2021
Journal
Scripta Materialia

Résumé

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.

Fichier(s) constituant cette publication

Nom:
PIMM_SM_GONG_2021.pdf
Taille:
2.330Mo
Format:
PDF
Fin d'embargo:
2021-09-01
Voir/Ouvrir

Cette publication figure dans le(s) laboratoire(s) suivant(s)