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

作者：Zhao Yakai; Lee Dong Hyun; Lee Jung A; Kim Woo Jin; Han Heung Nam; Ramamurty Upadrasta; Suh Jin Yoo; Jang Jae il

来源：International Journal of Hydrogen Energy, 2017, 42(16): 12015-12021.

DOI：10.1016/j.ijhydene.2017.02.061

• High-entropy alloy
• Hydrogen
• Nanoindentation
• Thermal desorption spectroscopy

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.

• 出版日期2017-4-20