期刊
SCRIPTA MATERIALIA
卷 185, 期 -, 页码 12-18出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.03.056
关键词
High entropy alloy; Void growth mechanism; Dislocation emission; Ductile fracture
类别
资金
- Japan Society for the Promotion of Science [17H06146, P19375]
- Japan Society for the Promotion of Science (JSPS) Fellowship for Research in Japan
- Austrian Science Fund (FWF) [P19375] Funding Source: Austrian Science Fund (FWF)
Void growth, as a critical stage in ductile fracture, could play some important role in the ductility of high entropy alloys (HEAs). Under a high-strain-rate tension (strain rate: 0.1 similar to 0.4/ns), our atomistic simulations reveal a severely suppressed growth of void (initial diameter: 4.0 similar to 9.1 nm) in HEAs at a low temperature, compared with that in Ni metal or Ni-based binary alloys. The emission of unclosed glide loops is found critical to void growth. Void growth is suppressed, once dislocation emission is suppressed due to the solute drag effect. Regarding the alloying elements, we find the void suppression relevance as Fe>Co and Cr>Fe>Mn. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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