SCRIPTA MATERIALIA | 卷:203 |
Exploring the hydrogen absorption and strengthening behavior in nanocrystalline face-centered cubic high-entropy alloys | |
Article | |
Zhao, Yakai1  Park, Jeong-Min2  Murakami, Kotaro3  Komazaki, Shin-ichi3  Kawasaki, Megumi4  Tsuchiya, Koichi5  Suh, Jin-Yoo6  Ramamurty, Upadrasta1,7  Jang, Jae-il2  | |
[1] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore | |
[2] Hanyang Univ, Div Mat Sci & Engn, Seoul 04763, South Korea | |
[3] Kagoshima Univ, Dept Mech Engn, Kagoshima 8900065, Japan | |
[4] Oregon State Univ, Sch Mech Ind & Mfg Engn, Corvallis, OR 97331 USA | |
[5] Natl Inst Mat Sci NIMS, Int Ctr Young Scientists, Tsukuba, Ibaraki 3050047, Japan | |
[6] Korea Inst Sci & Technol, Ctr Energy Mat Res, Seoul 02792, South Korea | |
[7] Agcy Sci Technol & Res, Inst Mat Res Engn, Singapore 138634, Singapore | |
关键词: High-entropy alloy; Nanocrystalline; Hydrogen; Nanoindentation; Activation volume; | |
DOI : 10.1016/j.scriptamat.2021.114069 | |
来源: Elsevier | |
【 摘 要 】
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.
【 授权许可】
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