Effect of hydrogen on grain boundary migration in tungsten

Y Yu and XL Shu and YN Liu and LL Niu and S Jin and F Gao and GH Lu, SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, 58, 077001 (2015).

DOI: 10.1007/s11433-015-5662-y

Motivated by a grain boundary (GB) healing mechanism that GB turns into a mobile sink through migration to eliminate the vacancies in a bulk, we have further investigated the influence of the retained hydrogen (H) on the GB migration in tungsten using a molecular dynamics simulation. We show that H hinders the GB migration at different H concentrations and temperatures, and such friction of GB migration due to the presence of H increases with the H concentration and decreases with temperature. We demonstrate that H follows the GB-migration as the temperature is higher than 300 K. Most importantly, the presence of H induces a disordering of GB, which affects the GB migration significantly.

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