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The dual role of hydrogen in grain boundary mobility
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- Ding, Yu (author)
- Norwegian Univ Sci & Technol NTNU, Dept Struct Engn, N-7491 Trondheim, Norway.
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- Zhao, Kai (author)
- Jiangnan Univ, Jiangsu Key Lab Adv Food Mfg Equipment & Technol, Wuxi 214122, Peoples R China.
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- Lin, Meichao (author)
- Norwegian Univ Sci & Technol NTNU, Dept Struct Engn, N-7491 Trondheim, Norway.
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- Norwegian Univ Sci & Technol NTNU, Dept Struct Engn, N-7491 Trondheim, Norway Jiangnan Univ, Jiangsu Key Lab Adv Food Mfg Equipment & Technol, Wuxi 214122, Peoples R China. (creator_code:org_t)
- American Institute of Physics (AIP), 2023
- 2023
- English.
- In: Journal of Applied Physics. - : American Institute of Physics (AIP). - 0021-8979 .- 1089-7550. ; 133:4
- Journal article (peer-reviewed)
Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- art (subject category)
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- Ding, Yu
- Zhao, Kai
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- Xiao, Senbo
- He, Jianying
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- Zhang, Zhiliang
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