Heterogeneous lattice strain strengthening in severely distorted crystalline solids

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jia Li
  • Yang Chen
  • Xiandong Xu
  • Chao Jiang
  • Bin Liu
  • Qihong Fang
  • Yong Liu
  • Peter K. Liaw

Detail(s)

Original languageEnglish
Article numbere2200607119
Journal / PublicationProceedings of the National Academy of Sciences of the United States of America
Volume119
Issue number25
Online published13 Jun 2022
Publication statusPublished - 21 Jun 2022

Link(s)

Abstract

Multi–principal element alloys (MPEAs) exhibit outstanding mechanical properties because the core effect of severe atomic lattice distortion is distinctly different from that of traditional alloys. However, at the mesoscopic scale the underlying physics for the abundant dislocation activities responsible for strength-ductility synergy has not been uncovered. While the Eshelby mean-field approaches become insufficient to tackle yielding and plasticity in severely distorted crystalline solids, here we develop a three-dimensional discrete dislocation dynamics simulation approach by taking into account the experimentally measured lattice strain field from a model FeCoCrNiMn MPEA to explore the heterogeneous strain-induced strengthening mechanisms. Our results reveal that the heterogeneous lattice strain causes unusual dislocation behaviors (i.e., multiple kinks/jogs and bidirectional cross slips), resulting in the strengthening mechanisms that underpin the strength-ductility synergy. The outcome of our research sheds important insights into the design of strong yet ductile distorted crystalline solids, such as high-entropy alloys and high-entropy ceramics.

Research Area(s)

  • discrete dislocation dynamics, dislocation kink/jog, heterogeneous lattice strain, Multi–principal element alloys, strengthening mechanism

Citation Format(s)

Heterogeneous lattice strain strengthening in severely distorted crystalline solids. / Li, Jia; Chen, Yang; He, Quanfeng; Xu, Xiandong; Wang, Hang; Jiang, Chao; Liu, Bin; Fang, Qihong; Liu, Yong; Yang, Yong; Liaw, Peter K.; Liu, Chain T.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 119, No. 25, e2200607119, 21.06.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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