期刊
ACTA MECHANICA SOLIDA SINICA
卷 35, 期 1, 页码 1-14出版社
SPRINGER
DOI: 10.1007/s10338-021-00261-9
关键词
Hydrogen; Nanoindentation; Homogeneous dislocation nucleation; Discrete dislocation dynamics
资金
- National Natural Science Foundation of China [11632007, 11802099]
The presence of hydrogen in single-crystal bcc Fe was found to reduce the nucleation strength of dislocations and promote their motion. This indicates that hydrogen has a significant impact on the behavior of dislocations.
The hydrogen effect on the nucleation and motion of dislocations in single-crystal bcc Fe with (110) surface was investigated by both nanoindentation experiments and discrete dislocation dynamics (DDD) simulation. The results of nanoindentation experiments showed that the pop-in load decreased evidently for the electrochemical hydrogen charging specimen, indicating that the dislocation nucleation strength might be reduced by hydrogen. In addition, the decrease of hardness due to hydrogen charging was also captured, implying that the dislocation motion might be promoted by hydrogen. By incorporating the effect of hydrogen on dislocation core energy, a DDD model was specifically proposed to investigate the influence of hydrogen on dislocation nucleation and motion. The results of DDD simulation revealed that under the effect of hydrogen, the dislocation nucleation strength is decreased and the motion of dislocation is promoted.
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