Superplastic-like flow in a fine-grained equiatomic CoCrFeMnNi high-entropy alloy

S. R. Reddy; S. Bapari; P. P. Bhattacharjee; A. H. Chokshi

doi:10.1080/21663831.2017.1305460

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Superplastic-like flow in a fine-grained equiatomic CoCrFeMnNi high-entropy alloy

Original Report | 更新时间：2026-08-19

- Superplastic-like flow in a fine-grained equiatomic CoCrFeMnNi high-entropy alloy
- Materials Research Letters Vol. 5, Issue 6, Pages: 408-414(2017)
- 作者机构：
  
  1. Department of Materials Science and Metallurgical Engineering IIT Hyderabad
  2. Department of Materials Engineering India Institute of Science
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2017.1305460
  CLC：
- Online First：27 March 2017，
  
  Published：2017
- 稿件说明：
移动端阅览
S. R. Reddy, S. Bapari, P. P. Bhattacharjee, et al. Superplastic-like flow in a fine-grained equiatomic CoCrFeMnNi high-entropy alloy[J]. Materials Research Letters, 2017, 5(6): 408-414.
DOI：

S. R. Reddy, S. Bapari, P. P. Bhattacharjee, et al. Superplastic-like flow in a fine-grained equiatomic CoCrFeMnNi high-entropy alloy[J]. Materials Research Letters, 2017, 5(6): 408-414. DOI： 10.1080/21663831.2017.1305460.

摘要

BSTRACTA CoCrFeMnNi high-entropy alloy (HEA) showed elongation to failure ∼320% at

= 1023 K and a strain rate . Strain hardening and texture weakening occurred at low

whereas flow softening and texture strengthening were observed at high experiments. The strain rate sensitivity (

) decreased from 0.5 to ∼0.25 with increasing . Deformation with

∼0.5 and deformation-enhanced grain g

rowth at low indicated superplasticity associated with grain boundary sliding. The grain boundary diffusion coefficient diminished by a factor of ∼4 in the HEA. Concurrent nucleation

growth and cavity interlinkage caused premature failure compared with conventional superplastic alloys.

Abstract

BSTRACTA CoCrFeMnNi high-entropy alloy (HEA) showed elongation to failure ∼320% at

= 1023 K and a strain rate . Strain hardening and texture weakening occurred at low

whereas flow softening and texture strengthening were observed at high experiments. The strain rate sensitivity (

) decreased from 0.5 to ∼0.25 with increasing . Deformation with

∼0.5 and deformation-enhanced grain growth at low indicated superplasticity associated with grain boundary sliding. The grain boundary diffusion coefficient diminished by a factor of ∼4 in the HEA. Concurrent nucleation

growth and cavity interlinkage caused premature failure compared with conventional superplastic alloys.

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