Understanding the hydrogen effect on pop-in behavior of an equiatomic 
high-entropy alloy during in-situ nanoindentation

Wang, Dong; Lu, Xu; Lin, Meichao; Wan, Di; Li, Zhiming; He, Jianying; Johnsen, Roy

doi:10.1016/j.jmst.2021.04.060

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Understanding the hydrogen effect on pop-in behavior of an equiatomic high-entropy alloy during in-situ nanoindentation

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Li, Zhiming
High-Entropy Alloys, Project Groups, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
School of Materials Science and Engineering, Central South University, Changsha 410083, China;

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Citation

Wang, D., Lu, X., Lin, M., Wan, D., Li, Z., He, J., et al. (2022). Understanding the hydrogen effect on pop-in behavior of an equiatomic high-entropy alloy during in-situ nanoindentation. Journal of Materials Science & Technology, 98, 118-122. doi:10.1016/j.jmst.2021.04.060.

Cite as: https://hdl.handle.net/21.11116/0000-0009-67B6-6

Abstract

The variations in the pop-in behavior of an equiatomic CoCrFeMnNi high-entropy alloy under different hydrogen charging/discharging conditions were characterized via in-situ electrochemical nanoindentation. Results show that hydrogen accumulatively reduces both pop-in load and width, among which the reduction of pop-in width is more noticeable than that of pop-in load. Moreover, the hydrogen reduction effect on both pop-in load and width is reversible when hydrogen is degassed during anodic discharging process. Particularly, the hydrogen-reduced pop-in width was studied in detail by a comprehensive energy balance model. It is quantitatively shown that the dissolved hydrogen enhances lattice friction, leading to an increased resistance to dislocation motion. As a result, fewer dislocations can be generated with a higher hydrogen concentration, causing a smaller pop-in width. This is the first time that the pop-in width indicated dislocation mobility under hydrogen impact is quantitively revealed. © 2021