Origin of micrometer-scale dislocation motion during hydrogen desorption
Name
eaaz1187.full.pdf
Description
Published version
Size
1.87 MB
Format
Adobe PDF
Checksum (MD5)
614fed6eafeae4cf6dbe57e08a11cb19
Author(s)
Koyama, Motomichi
Taheri Mousavi, Seyedeh Mohadeseh
Yan, Haoxue
Kim, Jinwoo
Cameron, Benjamin Clive
Moeini Ardakani, Sina(Seyed Sina)
Li, Ju
Tasan, Cemal
Date Issued
June 2020
Journal
Science Advances
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Koyama, Motomichi et al., "Origin of micrometer-scale dislocation motion during hydrogen desorption." Science Advances 6, 23 (June 2020): eaaz1187 doi. 10.1126/sciadv.aaz1187 ©2020 Authors
Version
Final published version
Abstract
Hydrogen, while being a potential energy solution, creates arguably the most important embrittlement problem in high-strength metals. However, the underlying hydrogen-defect interactions leading to embrittlement are challenging to unravel. Here, we investigate an intriguing hydrogen effect to shed more light on these interactions. By designing an in situ electron channeling contrast imaging experiment of samples under no external stresses, we show that dislocations (atomic-scale line defects) can move distances reaching 1.5 μm during hydrogen desorption. Combining molecular dynamics and grand canonical Monte Carlo simulations, we reveal that grain boundary hydrogen segregation can cause the required long-range resolved shear stresses, as well as short-range atomic stress fluctuations. Thus, such segregation effects should be considered widely in hydrogen research. ©2020 The Authors.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Terms of Use
Creative Commons Attribution NonCommercial License 4.0
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1126/sciadv.aaz1187
