The dual role of hydrogen in grain boundary mobilityShow others and affiliations
2023 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 133, no 4, article id 045103Article in journal (Refereed) Published
Abstract [en]
The effect of solute hydrogen on shear-coupled grain boundary (GB) migration is investigated with the dislocation-array type sigma 25(430)[001] GB and a dual role of hydrogen on GB mobility is unraveled. In the low temperature and high loading rate regime, where hydrogen diffusion is substantially slower than GB motion, GB breaks away from the hydrogen atmosphere and transforms into a new stable phase with highly enhanced mobility. In the reverse regime, hydrogen atoms move along with GB, exerting a drag force on GB and decreasing its mobility. These findings provide rationale for the coexistence of hydrogen hardening and softening observed experimentally in polycrystalline materials.
Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2023. Vol. 133, no 4, article id 045103
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-497069DOI: 10.1063/5.0132488ISI: 000922929200001OAI: oai:DiVA.org:uu-497069DiVA, id: diva2:1739025
Funder
The Research Council of Norway, 294689The Research Council of Norway, 2947392023-02-232023-02-232023-02-23Bibliographically approved