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Quantitative tests revealing hydrogen enhanced dislocation motion in α-iron

来源:    发布时间 : 2024-01-17   点击量:  
年份 专利号
授权公告日 发明人
期号、页码 22, 710–716 (2023) 期刊名称 Nature Materials
文章作者 Longchao Huang, Dengke Chen, Degang Xie, Suzhi Li, Yin Zhang, Ting Zhu, Dierk Raabe, En Ma, Ju Li & Zhiwei Shan

Hydrogen embrittlement jeopardizes the use of high-strength steels in critical load-bearing applications. However, uncertainty regarding how hydrogen affects dislocation motion, owing to the lack of quantitative experimental evidence, hinders our understanding of hydrogen embrittlement. Here, by studying the well-controlled, cyclic, bow-out motions of individual screw dislocations in α-iron, we find that the critical stress for initiating dislocation motion in a 2 Pa electron-beam-excited H2 atmosphere is 27–43% lower than that in a vacuum environment, proving that hydrogen enhances screw dislocation motion. Moreover, we find that aside from vacuum degassing, cyclic loading and unloading facilitates the de-trapping of hydrogen, allowing the dislocation to regain its hydrogen-free behaviour. These findings at the individual dislocation level can inform hydrogen embrittlement modelling and guide the design of hydrogen-resistant steels.


Link:Quantitative tests revealing hydrogen-enhanced dislocation motion in α-iron | Nature Materials

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