Electrochemical Dy-alloying behaviors of Ni-based alloys in molten LiF-CaF2-DyF3 and LiCl-KCl-DyCl3: Effects of temperature and electrolysis potential

被引：8

作者：

Yasuda, Kouji ^{[1
,2
,5
]}

Oishi, Tetsuo ^{[3
]}

Kagotani, Tomomi ^{[4
]}

Kawaguchi, Kenji ^{[4
]}

Yaguchi, Miki ^{[3
]}

Enomoto, Terumichi ^{[2
,4
]}

Nohira, Toshiyuki ^{[4
]}

机构：

[1] Kyoto Univ, Agcy Hlth Safety & Environm, Sakyo Ku, Yoshida Honmachi, Kyoto 6068501, Japan

[2] Kyoto Univ, Grad Sch Energy Sci, Dept Fundamental Energy Sci, Sakyo Ku, Yoshida Honmachi, Kyoto 6068501, Japan

[3] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058569, Japan

[4] Kyoto Univ, Inst Adv Energy, Uji, Kyoto 6110011, Japan

[5] Kyoto Univ, Grad Sch Engn, Dept Mat Sci & Engn, Sakyo Ku, Yoshida Honmachi, Kyoto 6068501, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 889卷

关键词：

Rare earth; Molten salt; Recycling; Electrochemical formation; Dy alloy; Hastelloy C-276; MAGNET SCRAPS; PHASE-CONTROL; ND; SEPARATION; EXTRACTION; RECOVERY; ELECTRODEPOSITION; METAL;

D O I：

10.1016/j.jallcom.2021.161605

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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. (C) 2021 Elsevier B.V. All rights reserved.

引用

页数：11

共 36 条

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