The dual role of hydrogen in grain boundary mobility

被引：5

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] Norwegian Univ Sci & Technol NTNU, Dept Struct Engn, N-7491 Trondheim, Norway

[2] Jiangnan Univ, Jiangsu Key Lab Adv Food Mfg Equipment & Technol, Wuxi 214122, Peoples R China

[3] Uppsala Univ, Dept Mat Sci & Engn, Div Appl Mech, SE-75121 Uppsala, Sweden

来源：

JOURNAL OF APPLIED PHYSICS | 2023年 / 133卷 / 04期

关键词：

ENHANCED LOCALIZED PLASTICITY; DISLOCATIONS; TRANSITION; MIGRATION; BEHAVIOR; MOTION; DRAG;

D O I：

10.1063/5.0132488

中图分类号：

O59 [应用物理学];

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 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.

引用

页数：7

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