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

Title
Hydrogen-induced nanohardness variations in a CoCrFeMnNi high-entropy alloy
Author
장재일
Keywords
High-entropy alloy; Hydrogen; Nanoindentation; Thermal desorption spectroscopy
Issue Date
2017-04
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v. 42, no. 16, page. 12015-12021
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.
URI
https://www.sciencedirect.com/science/article/pii/S0360319917305360?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/113638
ISSN
0360-3199; 1879-3487
DOI
10.1016/j.ijhydene.2017.02.061
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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