Isotropic and kinematic hardening of a high entropy alloy

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.

Automated summary

The contribution of kinematic hardening to the overall strain hardening of a high entropy alloy was investigated for the first time. The observed occurrence of high back stresses signifies substantial kinematic hardening, attributed to the low probability of cross-slip in the alloy. A model capturing these effects was proposed and validated.