Zhao, Yakai Park, Jeong-Min Murakami, Kotaro Komazaki, Shin-ichi Kawasaki, Megumi Tsuchiya, Koichi Suh, Jin-Yoo Ramamurty, Upadrasta Jang, Jae-il 2024-01-19T13:33:32Z 2024-01-19T13:33:32Z 2022-01-10 2021-10 1359-6462 https://pubs.kist.re.kr/handle/201004/116309 The effect of marked change in grain size from coarse-grained to nanocrystalline can affect the hydrogen absorption and plastic deformation behavior in two face-centered cubic high-entropy alloys (HEAs), viz. equiatomic CoCrFeNi and CoCrFeMnNi. Thermal desorption analysis of the hydrogen-charged samples proved that grain boundaries act as hydrogen traps and thus largely increase the hydrogen contents in the nanocrystalline samples. A direct comparison in the hydrogen absorption between two HEAs confirms that both chemical composition and grain size are crucial factors contributing to the hydrogen solubility of the HEAs. The parameters for the thermally activated deformation from nanoindentation rate-jump tests suggest enhanced lattice friction by hydrogen, leading to a reduction in activation volume and thus modification of the plastic deformation processes. The results are discussed in two aspects, viz. the effect of grain size and chemical composition on the hydrogen-affected plastic deformation. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD STRAIN-RATE SENSITIVITY HALL-PETCH RELATIONSHIP STACKING-FAULT ENERGY EMBRITTLEMENT RESISTANCE MECHANICAL-PROPERTIES NANOINDENTATION MICROSTRUCTURE DEFORMATION STABILITY HARDNESS Exploring the hydrogen absorption and strengthening behavior in nanocrystalline face-centered cubic high-entropy alloys Article 10.1016/j.scriptamat.2021.114069 1 SCRIPTA MATERIALIA, v.203 SCRIPTA MATERIALIA 203 scie scopus 000679473900010 2-s2.0-85109006079 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Science & Technology - Other Topics Materials Science Metallurgy & Metallurgical Engineering Article STRAIN-RATE SENSITIVITY HALL-PETCH RELATIONSHIP STACKING-FAULT ENERGY EMBRITTLEMENT RESISTANCE MECHANICAL-PROPERTIES NANOINDENTATION MICROSTRUCTURE DEFORMATION STABILITY HARDNESS High-entropy alloy Nanocrystalline Hydrogen Nanoindentation Activation volume