一种在高应变速率下变形的NiCrFeCoMn高熵合金的力学性能和微观结构

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

作者信息

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

机构信息

State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China.

School of Materials Science and Engineering, Central South University, Changsha 410083, China.

出版信息

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

DOI:10.3390/e20110892

PMID:33266616

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7512474/

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 to 4600 s) 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 to 4600 s. 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.

摘要

通过电弧熔炼制备的等原子NiCrFeCoMn高熵合金具有单一的晶体结构。研究了在高应变速率（900 s至4600 s）下变形的NiCrFeCoMn高熵合金的力学性能和微观结构。NiCrFeCoMn高熵合金的屈服强度对高应变速率的变化敏感。在900 s至4600 s应变速率下变形的合金的流动应力曲线上也观察到了锯齿行为。Zerilli-Armstrong本构方程可用于预测NiCrFeCoMn高熵合金的流动应力曲线。大量的变形带导致NiCrFeCoMn高熵合金在动态加载下出现明显的锯齿行为。