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

Reddy, S. R. and Bapari, S. and Bhattacharjee, Pinaki Prasad and Chokshi, A. H. (2017) Superplastic-like flow in a fine-grained equiatomic CoCrFeMnNi high-entropy alloy. Materials Research Letters, 5 (6). pp. 408-414. ISSN 2166-3831

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A CoCrFeMnNi high-entropy alloy (HEA) showed elongation to failure similar to 320% at T = 1023 K and a strain rate. epsilon = 10(-4) s(-1). Strain hardening and texture weakening occurred at low. e, whereas flow softening and texture strengthening were observed at high. epsilon (> 3 x 10(-2) s(-1)) experiments. The strain rate sensitivity (m) decreased from 0.5 to similar to 0.25 with increasing. epsilon. Deformation with m similar to 0.5 and deformation-enhanced grain growth at low. e indicated superplasticity associated with grain boundary sliding. The grain boundary diffusion coefficient diminished by a factor of similar to 4 in the HEA. Concurrent nucleation, growth and cavity interlinkage caused premature failure compared with conventional superplastic alloys.

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IITH Creators:
IITH CreatorsORCiD
Bhattacharjee, Pinaki Prasad
Item Type: Article
Uncontrolled Keywords: High-entropy alloys; superplasticity; strain rate sensitivity; texture; cavitation
Subjects: Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Depositing User: Team Library
Date Deposited: 14 Sep 2017 09:41
Last Modified: 14 Sep 2017 09:41
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