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タイトル: | Direct imaging of the disconnection climb mediated point defects absorption by a grain boundary |
著者: | Wei, Jiake Feng, Bin Tochigi, Eita Shibata, Naoya Ikuhara, Yuichi |
著者名の別形: | 幾原, 雄一 |
キーワード: | Surfaces, interfaces and thin films Transmission electron microscopy |
発行日: | 2022 |
出版者: | Springer Nature |
誌名: | Nature Communications |
巻: | 13 |
論文番号: | 1455 |
抄録: | Grain boundaries (GBs) are considered as the effective sinks for point defects, which improve the radiation resistance of materials. However, the fundamental mechanisms of how the GBs absorb and annihilate point defects under irradiation are still not well understood at atomic scale. With the aid of the atomic resolution scanning transmission electron microscope, we experimentally investigate the atomistic mechanism of point defects absorption by a ∑31 GB in α-Al2O3 under high energy electron beam irradiation. It is shown that a disconnection pair is formed, during which all the Al atomic columns are tracked. We demonstrate that the formation of the disconnection pair is proceeded with disappearing of atomic columns in the GB core, which suggests that the GB absorbs vacancies. Such point defect absorption is attributed to the nucleation and climb motion of disconnections. These experimental results provide an atomistic understanding of how GBs improve the radiation resistance of materials. |
著作権等: | © The Author(s) 2022 This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. |
URI: | http://hdl.handle.net/2433/276951 |
DOI(出版社版): | 10.1038/s41467-022-29162-2 |
PubMed ID: | 35304472 |
出現コレクション: | 学術雑誌掲載論文等 |
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