Mechanical Properties and Microstructure of a NiCrFeCoMn High-Entropy Alloy Deformed at High Strain Rates

Bingfeng Wang; Xianrui Yao; Chu Wang; Xiaoyong Zhang; Xiaoxia Huang

doi:10.3390/e20110892

Mechanical Properties and Microstructure of a NiCrFeCoMn High-Entropy Alloy Deformed at High Strain Rates

Entropy (Basel). 2018 Nov 21;20(11):892. doi: 10.3390/e20110892.

Authors

Bingfeng Wang^{1

2}, Xianrui Yao², Chu Wang², Xiaoyong Zhang¹, Xiaoxia Huang²

Affiliations

¹ State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China.
² School of Materials Science and Engineering, Central South University, Changsha 410083, China.

Abstract

The equiatomic NiCrFeCoMn high-entropy alloy prepared by arc melting has a single crystallographic structure. Mechanical properties and microstructure of the NiCrFeCoMn high-entropy alloy deformed at high strain rates (900 s^-1 to 4600 s^-1) were investigated. The yield strength of the NiCrFeCoMn high-entropy alloy is sensitive to the change of high strain rates. Serration behaviors were also observed on the flow stress curves of the alloy deformed at the strain rates ranging from 900 s^-1 to 4600 s^-1. The Zerilli-Armstrong constitutive equation can be used to predict the flow stress curves of the NiCrFeCoMn high-entropy alloy. Large amounts of deformation bands led to obvious serration behaviors of the NiCrFeCoMn high-entropy alloy under dynamic loading.

Keywords: electron microscopy; high-entropy alloy; plasticity; plasticity methods; serration behavior.