Yang, Guanghui Zhao, Yakai Lee, Dong-Hyun Park, Jeong-Min Seok, Moo-Young Suh, Jin-Yoo Ramamurty, Upadrasta Jang, Jae-il 2024-01-19T20:32:21Z 2024-01-19T20:32:21Z 2021-09-02 2019-03-01 1359-6462 https://pubs.kist.re.kr/handle/201004/120232 The influence of hydrogen on the onset of plastic deformation in a CoCrFeMnNi high-entropy alloy (HEA) was examined through the analysis of the load at which first pop-in during spherical nanoindentation experiments occurs on hydrogen-charged and subsequently aged specimens. Results reveal that the dissolved hydrogen lowers the plastic flow resistance, indicated by the shear yield strength, tau(y), by modifying defect formation energies. Aging, subsequent to charging, leads to recovery of tau(y), but only partially. The results are discussed in terms of the vacancy-mediated dislocation nucleation, which is supported by the estimated activation volume for deformation. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD DISLOCATION NUCLEATION GRAIN-BOUNDARIES SINGLE-CRYSTALS NANOINDENTATION STRENGTH EMBRITTLEMENT RESISTANCE BEHAVIOR INDENTATION TEMPERATURE Influence of hydrogen on incipient plasticity in CoCrFeMnNi high-entropy alloy Article 10.1016/j.scriptamat.2018.10.010 1 SCRIPTA MATERIALIA, v.161, pp.23 - 27 SCRIPTA MATERIALIA 161 23 27 scie scopus 000450375500005 2-s2.0-85054691760 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Science & Technology - Other Topics Materials Science Metallurgy & Metallurgical Engineering Article DISLOCATION NUCLEATION GRAIN-BOUNDARIES SINGLE-CRYSTALS NANOINDENTATION STRENGTH EMBRITTLEMENT RESISTANCE BEHAVIOR INDENTATION TEMPERATURE High-entropy alloy Hydrogen Nanoindentation Vacancy