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Onset of plasticity of helium-implanted ferritic/martensitic steels during nanoindentation

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Title: Onset of plasticity of helium-implanted ferritic/martensitic steels during nanoindentation
Authors: Chen, Siwei Browse this author
Wang, Yongming Browse this author
Hashimoto, Naoyuki Browse this author
Ohnuki, Somei Browse this author →KAKEN DB
Keywords: incipient plasticity
helium implantation
oxide particle
nanoindentation
Issue Date: Jul-2014
Publisher: Taylor & Francis
Journal Title: Philosophical Magazine Letters
Volume: 94
Issue: 7
Start Page: 433
End Page: 438
Publisher DOI: 10.1080/09500839.2014.921347
Abstract: The onset of plasticity during nanoindentation is a new method to investigate the irradiation damage of structural materials in fission and fusion reactors. In this paper, nanoindentation experiment was carried out to helium implanted F82H-IEA and nano-sized oxide dispersion strengthened F82H-ODS steels for studying the elastic-plastic transition at a constant loading rate. The onset of plasticity shifted after helium implantation. By a statistical thermal activation model, activation volume was extracted to discuss the strength of barrier for dislocation motion. The results reveal an increase in the pinning force and number density of effective obstacles for dislocation motion in He-implanted F82H-IEA, and a decrease in the local pinning force without changing the density of effective obstacles in He-implanted F82H-ODS.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Philosophical Magazine Letters on July 2014, available online: http://www.tandfonline.com/10.1080/09500839.2014.921347
Type: article (author version)
URI: http://hdl.handle.net/2115/59456
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大貫 惣明

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