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タイトル: | Electrochemical Dy-alloying behaviors of Ni-based alloys in molten LiF–CaF₂–DyF₃ and LiCl–KCl–DyCl₃: Effects of temperature and electrolysis potential |
著者: | Yasuda, Kouji Oishi, Tetsuo Kagotani, Tomomi Kawaguchi, Kenji https://orcid.org/0000-0002-8883-9040 (unconfirmed) Yaguchi, Miki Enomoto, Terumichi Nohira, Toshiyuki |
著者名の別形: | 安田, 幸司 籠谷, 友美 川口, 健次 榎本, 光伯 野平, 俊之 |
キーワード: | Rare earth Molten salt Recycling Electrochemical formation Dy alloy Hastelloy C-276 |
発行日: | 31-Dec-2021 |
出版者: | Elsevier BV |
誌名: | Journal of Alloys and Compounds |
巻: | 889 |
論文番号: | 161605 |
抄録: | The effects of temperature and electrolysis potential on the alloying rate, structure, and mechanical strength for the Dy-alloyed Hastelloy C-276 samples, where Hastelloy C-276 is a Ni-based alloy containing Cr and Mo, were investigated in a molten LiF–CaF₂–DyF₃ (0.30 or 0.50 mol%) system at 1123–1323 K and a molten LiCl–KCl–DyCl₃ (0.50 mol%) system at 873 K. The microstructure was studied by electron microscopy and energy-dispersive X-ray spectrometry analyses, and the mechanical strength of the formed Dy-alloys was evaluated using punch tests. The alloying rate was influenced by the electrolysis potential and significantly by the temperature. Phase separation into DyNi₂ and Cr–Mo was observed, and a layered structure perpendicular to the depth direction was formed. The pitch of the layered structure was found to depend on the electrolysis potential, suggesting that the diffusion rate of Cr and Mo determined the structure. The Dy-alloyed samples electrolyzed at a more negative potential in the LiCl–KCl–DyCl₃ melt exhibited a higher mechanical strength. The Dy-alloyed samples obtained in the LiF–CaF₂–DyF₃ melt at 1223 K and 1323 K exhibited a low mechanical strength owing to the large grain size of the agglomerated Cr–Mo alloy phase. |
著作権等: | © 2021. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license. The full-text file will be made open to the public on 31 December 2023 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/265844 |
DOI(出版社版): | 10.1016/j.jallcom.2021.161605 |
出現コレクション: | 学術雑誌掲載論文等 |
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