Acta Metallurgica Sinica (English Letters) ›› 2022, Vol. 35 ›› Issue (8): 1275-1280.DOI: 10.1007/s40195-021-01362-7

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Exploring the Formation Mechanism of Deformation Twins in CrMnFeCoNi High Entropy Alloy

Junwei Xie1, Haokai Dong2, Yuxiu Hao1, Zhongding Fan1, Chang-An Wang1()   

  1. 1State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
    2National Engineering Research Center of Near‑net‑Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510641, China
  • Received:2021-09-09 Revised:2021-09-28 Accepted:2021-10-12 Online:2022-08-10 Published:2021-12-02
  • Contact: Chang-An Wang
  • About author:Chang‑An Wang wangca@mail.tsinghua.edu.cn
    First author contact:Junwei Xie and Haokai Dong the authors contributed equally to this work.

Abstract:

The deformation twins initiated in CrMnFeCoNi high entropy alloy at cryogenic temperature are experimentally studied. Under the external loading, a three-dimensional shear stress concentration originating from dislocation tangling at both the grain boundaries and twin boundaries could be formed, which promotes emission of partial dislocations from the planar defects and is thus considered to be the key factor for twin formation. A sympathetic nucleation mechanism is proposed to describe the nucleation behaviors of twins.

Key words: High entropy alloy, Deformation twinning, Defects, Shear stress concentration