Isotropic and kinematic hardening of a high entropy alloy

SCRIPTA MATERIALIA

卷:191

Article

Bouaziz, Olivier^1,2  Moon, Jongun³  Kim, Hyoung Seop³  Estrin, Yuri^4,5 

[1] Univ Lorraine, Lab Etud Microstruct & Mecan Mat LEM3, Arts & Metier Paris Tech, CNRS, F-57000 Metz, France

[2] Univ Lorraine, Lab EXcellence DAMAS, DAMAS, F-57000 Metz, France

[3] Pohang Univ Sci & Technol POSTECH, Grad Instite Ferrous Technol, Pohang 37673, South Korea

[4] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia

[5] Univ Western Australia, Dept Mech Engn, Crawley, WA 6009, Australia

关键词: High entropy alloys;    Isotropic hardening;    Kinematic hardening;    Back stress;    Bauschinger effect;   

DOI  :  10.1016/j.scriptamat.2020.09.022

来源: Elsevier

【 摘 要 】

The contribution of kinematic hardening to the overall strain hardening of a high entropy alloy (HEA) was investigated for the first time ever. It was assessed for a single-phase equiatomic CoCrFeMnNi alloy based on a study of the Bauschinger effect. The observed occurrence of high back stresses signifies substantial kinematic hardening. We attribute it to the low probability of cross-slip in this HEA which, however, rises in the process of straining. A model that captures the mentioned effects was proposed and validated. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free