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Hydrogen-induced nanohardness variations in a CoCrFeMnNi high-entropy alloy
- Authors
- Zhao, Yakai; Lee, Dong-Hyun; Lee, Jung-A; Kim, Woo-Jin; Han, Heung Nam; Ramamurty, Upadrasta; Suh, Jin-Yoo; Jang, Jae-il
- Issue Date
- Apr-2017
- Publisher
- Elsevier
- Keywords
- High-entropy alloy; Hydrogen; Nanoindentation; Thermal desorption spectroscopy
- Citation
- International Journal of Hydrogen Energy, v.42, no.16, pp 12015 - 12021
- Pages
- 7
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- International Journal of Hydrogen Energy
- Volume
- 42
- Number
- 16
- Start Page
- 12015
- End Page
- 12021
- ISSN
- 0360-3199
1879-3487
- 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.
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Related Researcher
- Jang, Jae Il
- COLLEGE OF ENGINEERING (SCHOOL OF MATERIALS SCIENCE AND ENGINEERING)