期刊
SCRIPTA MATERIALIA
卷 138, 期 -, 页码 83-87出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.05.048
关键词
Permanent magnet; Grain boundary diffusion; Tb-rich shells; Pr-Tb-Cu-Al alloys; Coercivity
类别
资金
- National Natural Science Foundation of China [51401021]
- State Key Laboratory for Advanced Metals and Materials [2016Z-14]
Commercial N-50 Nd-Fe-B magnet was processed by grain boundary diffusing Pr-Tb-Cu-Al alloys. The coercivity increased from original 944.9 kA/m to 1640.6 kA/m, 1741.6 kA/m, 1740.2 kA/m and 1775.4 kA/m by diffusing Tb70Cu30, Pr52.5Tb17.6 Cu-30, Pr60Tb20Al20 and Pr60Tb10Cu15Al15 alloys, respectively. Microstructural analysis confirmed Tb-rich shells on the surfaces of Nd2Fe14B grains, contributing to coercivity enhancement of diffused sample. Especially, the partial replacement of Tb by Pr in diffusion sources resulted in higher coercivity by consuming fewer Tb elements, only 0.34-0.53 wt% Tb in the sample by Pr-Tb-Cu-Al, much lower than 1.82 wt% Tb in the sample by Tb-Cu. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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