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j.nme.2018.07.007.pdf | 952.61 kB | Adobe PDF | 見る/開く |
タイトル: | First-principles calculations of interaction between solutes and dislocations in tungsten |
著者: | Tsuru, T. Suzudo, T. |
著者名の別形: | 都留, 智仁 |
キーワード: | Solution softening Transmutation products Dislocation First-principles Tungsten alloys |
発行日: | Aug-2018 |
出版者: | Elsevier BV |
誌名: | Nuclear Materials and Energy |
巻: | 16 |
開始ページ: | 221 |
終了ページ: | 225 |
抄録: | Changes in mechanical properties due to transmutation products (Re and Os) in W alloys is a central issue for plasma-facing materials in fusion reactors. We conducted density functional theory calculations to investigate the effect of Re, Os, and other 5d solutes on core structure and motion of screw dislocations associated with plastic deformation. Ir, Pt, Au, and Hg solutes show strong attractive interactions with screw dislocations, causing solution strengthening by the pinning mechanism. On the other hand, Hf, Ta, and Re cause softening by facilitating dislocation motion around solutes. This prediction corresponds well with the experimental observation of softening behavior in W-Re alloys. |
著作権等: | © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/). |
URI: | http://hdl.handle.net/2433/236170 |
DOI(出版社版): | 10.1016/j.nme.2018.07.007 |
出現コレクション: | 学術雑誌掲載論文等 |
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