Origin of micrometer-scale dislocation motion during hydrogen desorption

Motomichi Koyama, Seyedeh Mohadeseh Taheri-Mousavi, Seyedeh Mohadeseh Taheri-Mousavi, Haoxue Yan, Jinwoo Kim, Benjamin Clive Cameron, Seyed Sina Moeini-Ardakani, Ju Li, Ju Li, Cemal Cem Tasan

Research output: Contribution to journalArticle

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.

Original languageEnglish
Article numberEAAZ1187
JournalScience Advances
Volume6
Issue number23
DOIs
Publication statusPublished - 2020 Jun

ASJC Scopus subject areas

  • General

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    Koyama, M., Taheri-Mousavi, S. M., Taheri-Mousavi, S. M., Yan, H., Kim, J., Cameron, B. C., Moeini-Ardakani, S. S., Li, J., Li, J., & Tasan, C. C. (2020). Origin of micrometer-scale dislocation motion during hydrogen desorption. Science Advances, 6(23), [EAAZ1187]. https://doi.org/10.1126/sciadv.aaz1187