The dual role of hydrogen in grain boundary mobility

被引：0

作者：

Ding, Yu ^{[1
]}

Zhao, Kai ^{[2
]}

Lin, Meichao ^{[1
]}

Yu, Haiyang ^{[3
]}

Xiao, Senbo ^{[1
]}

He, Jianying ^{[1
]}

Zhang, Zhiliang ^{[1
]}

机构：

[1] Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), Trondheim,7491, Norway

[2] Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangnan University, Wuxi,214122, China

[3] Division of Applied Mechanics, Department of Materials Science and Engineering, Uppsala University, Uppsala,SE-75121, Sweden

来源：

Journal of Applied Physics | 2023年 / 133卷 / 04期

关键词：

Number: 294689,294739, Acronym: -, Sponsor: Norges Forskningsråd,;

D O I：

暂无

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学科分类号：

摘要：

The effect of solute hydrogen on shear-coupled grain boundary (GB) migration is investigated with the dislocation-Array type ς25(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. © 2023 Author(s).

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