期刊
SCRIPTA MATERIALIA
卷 181, 期 -, 页码 127-133出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.02.021
关键词
High entropy alloys; Dislocations; Stacking faults; Strength; Concentration inhomogeneity
类别
资金
- US-NSF-DMR [1804320]
This Viewpoint article articulates ten unusual features associated with dislocations and their slip processes in high-entropy alloys (HEAs). Attention will be directed towards the composition undulation almost inevitable in these highly concentrated solutions, even when the alloy is a single-phase and nominally random solution. This inhomogeneity is often exacerbated by lattice distortion and local chemical order arising from the interaction among multiple principal elements. As a consequence, dislocation motion faces a rugged atomic and energy landscape, presenting new twists in defect energetics and properties, as well as cocktail strengthening as a new form of solid solution hardening beyond the conventional mechanism. Our systematic account from this standpoint may help answer the continual query in the community as to what is special about these HEAs that makes them different from traditional solid solutions. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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