The dual role of hydrogen in grain boundary mobility-Reference-Cited by-同舟云学术

The dual role of hydrogen in grain boundary mobility

Published:2023-01-26 Issue:4 Volume:133 Page:
ISSN:0021-8979
Container-title:Journal of Applied Physics
language:en
Short-container-title:

Author:

Ding Yu¹^ORCID,Zhao Kai²^ORCID,Lin Meichao¹^ORCID,Yu Haiyang³^ORCID,Xiao Senbo¹^ORCID,He Jianying¹^ORCID,Zhang Zhiliang¹^ORCID

Affiliation:

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

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

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

Abstract

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.

Funder

Research council of Norway

Publisher

AIP Publishing

Subject

General Physics and Astronomy

Link

https://pubs.aip.org/aip/jap/article-pdf/doi/10.1063/5.0132488/16767436/045103_1_online.pdf

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