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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Abstract

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 Creators ORCiD Bhattacharjee, Pinaki Prasad http://orcid.org/0000-0002-6422-2601
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
URI:	http://raiithold.iith.ac.in/id/eprint/3544
Publisher URL:	https://doi.org/10.1080/21663831.2017.1305460
OA policy:	http://www.sherpa.ac.uk/romeo/issn/2166-3831/
Related URLs:	Google Scholar

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