Formation of anti-shell/core structure of heavy rare earth elements (Tb, Dy) in sintered Nd-Fe-B magnet after grain boundary diffusion process

被引：72
作者：
Li, Weidong [1 ,2 ]
Zhang, Qingke [1 ]
Zhu, Qihang [1 ]
Xiao, Song [1 ]
Xu, Cheng [1 ]
Yang, Lijing [1 ]
Zheng, Bizhang [1 ,3 ]
Mao, Shoudong [4 ]
Song, Zhenlun [1 ]
机构：
[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhejiang Prov Key Lab Magnet Mat & Applicat Techn, CAS Key Lab Magnet Mat & Devices, Ningbo 315201, Zhejiang, Peoples R China
[2] Univ Sci & Technol China, Nano Sci & Technol Inst, Suzhou 215123, Peoples R China
[3] Baotou Hidyree Technol Co Ltd, Baotou 014030, Peoples R China
[4] Hangzhou Permanent Magnet Grp Co Ltd, Hangzhou 311231, Zhejiang, Peoples R China
来源：
SCRIPTA MATERIALIA | 2019年 / 163卷
关键词：
Sintered Nd-Fe-B magnet; Magnetron sputtering; Heavy rare earth elements; Grain boundary diffusion process; Anti-shell/core structure; COERCIVITY ENHANCEMENT; TEMPERATURE; MICROSTRUCTURE; MECHANISM; BEHAVIOR;
D O I：
10.1016/j.scriptamat.2018.12.034
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The evolution of microstructure close to the surface of sintered Nd-Fe-B magnet after grain boundary diffusion process (GBDP) of heavy rare earth elements (HREE, Tb, Dy) was investigated. It was found that two new types of microstructure, anti-shell/core and no-shell structures, were formed in the magnet with the diffusion time longer than 0.5 h. The anti-shell/core structure was formed due to an abnormal diffusion of HREE from grain to grain boundary based on the dual-trend diffusion model, it contributes a negative effect on the coercivity of diffused magnets. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：40 / 43
页数：4
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