☆ 4.7 Article

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

SCRIPTA MATERIALIA (2021)

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Journal

SCRIPTA MATERIALIA
Volume 194, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.113652

Keywords

LBE; Liquid metal embrittlement; High-entropy alloys; Cracking; Phase boundary wetting

Categories

Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering

Funding

  1. National Natural Science Foundation of China [51801129, 51701170]
  2. Natural Science Foundation of Shenzhen University, China [85304-000 0 0302]

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This study reports a new liquid metal embrittlement (LME) system in which Al0.7CoCrFeNi high-entropy alloy is embrittled by lead-bismuth eutectic (LBE) at 350 and 500 degrees C. Different cracking modes are observed at these two temperatures, indicating a transition in the mechanism of LME.
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 degrees C. At 350 degrees 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 degrees 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 degrees C to a phase boundary wetting-dominated LME mechanism at 500 degrees C. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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