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

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.

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 Creators:
Wang, Dong1, Author              
Lu, Xu1, Author              
Lin, Meichao2, Author
Wan, Di3, Author              
Li, Zhiming4, 5, Author              
He, Jianying2, Author
Johnsen, Roy1, Author
Affiliations:
1Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, No-7491, Trondheim, Norway, ou_persistent22              
2Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway, ou_persistent22              
3Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, Richard Birkelands vei 2B, N-7491 Trondheim, Norway, ou_persistent22              
4High-Entropy Alloys, Project Groups, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_3010672              
5School of Materials Science and Engineering, Central South University, Changsha 410083, China, ou_persistent22              

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Free keywords: Chromium alloys; Cobalt alloys; Entropy; High-entropy alloys; Iron alloys; Manganese alloys; Reduction, Comprehensive energy; Discharging process; Dislocation mobility; Dislocation motion; Dissolved hydrogen; Hydrogen charging; Hydrogen concentration; Hydrogen reduction, Nanoindentation
 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

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Language(s): eng - English
 Dates: 2022-01-30
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.jmst.2021.04.060
 Degree: -

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Title: Journal of Materials Science & Technology
  Other : J. Mater. Sci. Technol.
Source Genre: Journal
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Publ. Info: Shenyang, China : Editorial Board of Journal of Materials Science and Technology
Pages: - Volume / Issue: 98 Sequence Number: - Start / End Page: 118 - 122 Identifier: ISSN: 1005-0302
CoNE: https://pure.mpg.de/cone/journals/resource/954925584235