The dual role of hydrogen in grain boundary mobility

Y Ding and K Zhao and MC Lin and HY Yu and SB Xiao and JY He and ZL Zhang, JOURNAL OF APPLIED PHYSICS, 133, 045103 (2023).

DOI: 10.1063/5.0132488

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.

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