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Atomistic study of the competitive relationship between edge dislocation motion and hydrogen diffusion in alpha iron

Published online by Cambridge University Press:  24 May 2011

Shinya Taketomi ,
Ryosuke Matsumoto  and
Noriyuki Miyazaki
Shinya Taketomi*
Affiliation:
Department of Mechanical Engineering, Graduate School of Science and Engineering, Saga University, Saga 840-8502, Japan
Ryosuke Matsumoto
Affiliation:
Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
Noriyuki Miyazaki
Affiliation:
Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
*
a)Address all correspondence to this author. e-mail: taketomi@me.saga-u.ac.jp
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Abstract

The interaction between a dislocation and hydrogen is considered to play an important role in hydrogen-related fractures for metals; it has been experimentally reported that hydrogen affects the dislocation mobility. These studies, however, show different macroscopic softening and/or hardening effects in iron, and the interaction between the dislocation and hydrogen remains unclear. In this study, we investigated the occurrence of interactions between a {112}<111> edge dislocation and a hydrogen atom via the estimation of the stress-dependent energy barriers for the dislocation motion and hydrogen diffusion in alpha iron using atomistic calculations. Our results show the existence of boundary stress conditions: dislocation mobility increment (softening) occurs at a lower applied stress, dislocation mobility decrement (hardening) occurs at an intermediate stress, and no effects occur for the steady motion of a dislocation at a higher stress in this analysis condition.

Keywords

DislocationsmFe

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Type
Articles
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Journal of Materials Research , Volume 26 , Issue 10 , 28 May 2011 , pp. 1269 - 1278
Copyright
Copyright © Materials Research Society 2011

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