Coercivity enhancement of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B powders by the diffusion of Nd-Cu eutectic alloys

被引：205
作者：
Sepehri-Amin, H. [1 ,2 ]
Ohkubo, T. [1 ]
Nishiuchi, T. [3 ]
Hirosawa, S. [3 ]
Hono, K. [1 ,2 ]
机构：
[1] Natl Inst Mat Sci, Magnet Mat Ctr, Tsukuba, Ibaraki 3050047, Japan
[2] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058571, Japan
[3] Hitachi Met Ltd, NEOMAX Co, Magnet Mat Res Lab, Osaka 6180013, Japan
来源：
SCRIPTA MATERIALIA | 2010年 / 63卷 / 11期
关键词：
Nd-Fe-B; Permanent magnet; Diffusion process; Coercivity; NUCLEATION CONTROLLED MAGNETS; SINTERED MAGNETS; MAGNETIZATION REVERSAL; PERMANENT-MAGNETS; MICROSTRUCTURE; SIZE;
D O I：
10.1016/j.scriptamat.2010.08.021
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We report the coercivity enhancement of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B nanocrystalline powders from 1321 to 1552 kA m(-1) (19.5 kOe) by the grain boundary diffusion of Nd-Cu melts with hyper-eutectic compositions. A distinct Nd-rich grain boundary phase was observed after the diffusion process by scanning electron microscopy and transmission electron microscopy; however, atom probe tomography indicated that the change in composition of the grain boundary phase was not significant. The mechanism of the coercivity enhancement is discussed based on these results. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1124 / 1127
页数：4
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