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Mobility of point defects in CoCrFeNi-base high entropy alloys
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| Title: | Mobility of point defects in CoCrFeNi-base high entropy alloys |
| Authors: | Hashimoto, Naoyuki Browse this author | | Ono, Yuta Browse this author |
| Keywords: | High entropy alloy | | In-situ irradiation | | Precipitation | | Positron annihilation | | Point defect mobility | | Transmission electron microscope |
| Issue Date: | Jun-2021 |
| Publisher: | Elsevier |
| Journal Title: | Intermetallics |
| Volume: | 133 |
| Start Page: | 107182 |
| Publisher DOI: | 10.1016/j.intermet.2021.107182 |
| Abstract: | The in-situ observation of microstructural evolution under electron irradiation was performed
in order to experimentally estimate the mobility of vacancy and interstitial in 316 stainless steel
and CoCrFeNi-base high entropy alloys. The vacancy migration energy in CoCrFeNiMn and
CoCrFeNiAl 0.3 was estimated to be lower and higher compared with that in 316 stainless steel,
respectively. While, the interstitial migration energy in those alloys seems to be almost the same.
The increase in vacancy migration energy in CoCrFeNiAl0.3 is probably due to a strong
interaction between vacancy and Al. The positron annihilation analysis revealed that vacancies
might exist close to Co and Ni atoms in CoCrFeNi-base high entropy alloys. In addition,
vacancies could also be captured by Mn and Al atoms in CoCrFeNiMn and CoCrFeNiAl0.3 ,
respectively. The electron- and ion-irradiation at 400 and 300 °C up to 1.5 dpa resulted in the
precipitation of the intermetallic compounds, such as CoFe, NiFe in CoCrFeNiMn, and Ni 3Al
in CoCrFeNiAl 0.3 . From these results, it is suggested that Co, Ni, Mn, and Al atoms could affect
the vacancy mobility in HEAs, leading to the delay of microstructural evolution and the
enhancement of precipitation under irradiation. |
| Rights: | © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/88576 |
| 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)
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Submitter: 橋本 直幸
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