Hydrogen-induced nanohardness variations in a CoCrFeMnNi high-entropy alloy
- Hydrogen-induced nanohardness variations in a CoCrFeMnNi high-entropy alloy
- 서진유; Yakai Zhao; 이동현; 이정아; 김우진; 한흥남; Upadrasta Ramamurty; 장재일
- High-entropy alloy; Hydrogen; Nanoindentation; Thermal desorption spectroscopy
- Issue Date
- International journal of hydrogen energy
- VOL 42, NO 16-12021
- The influence of electrochemically charged hydrogen (H) on the hardness (HN) of a CoCrFeMnNi high-entropy alloy (HEA) was investigated with nanoindentation. Upon charging, HN of HEA increases by ∼60%, which decreases gradually during subsequent aging at room temperature, and on prolonged aging, the alloy softens to an extent that HN 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.
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