Hydrogen-induced nanohardness variations in a CoCrFeMnNi high-entropy alloy

Zhao, Yakai and Lee, Dong-Hyun and Lee, Jung-A and Kim, Woo-Jin and Han, Heung Nam and Ramamurty, Upadrasta and Suh, Jin-Yoo and Jang, Jae-il (2017) Hydrogen-induced nanohardness variations in a CoCrFeMnNi high-entropy alloy. In: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 42 (16). pp. 12015-12021.

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Abstract

The influence of electrochemically charged hydrogen (H) on the hardness (H-N) of a CoCrFeMnNi high-entropy alloy (HEA) was investigated with nanoindentation. Upon charging, H-N of HEA increases by similar to 60%, which decreases gradually during subsequent aging at room temperature, and on prolonged aging, the alloy softens to an extent that H-N falls below that of the uncharged HEA. These H-induced mechanical property variations are rationalized in terms of the competition between solid solution hardening caused by H and excess vacancy creation due to deeply trapped H. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Additional Information:	Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	15 Jul 2017 04:52
Last Modified:	15 Jul 2017 04:52
URI:	http://eprints.iisc.ac.in/id/eprint/57402

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