Microstructure of fine-grained Nd-Fe-B sintered magnets with high coercivity

被引：171
|
作者：
Sepehri-Amin, H. [1 ]
Une, Y. [2 ]
Ohkubo, T. [1 ]
Hono, K. [1 ]
Sagawa, M. [2 ]
机构：
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
[2] Intermetall Co Ltd, Kyoto 6158245, Japan
来源：
SCRIPTA MATERIALIA | 2011年 / 65卷 / 05期
关键词：
Nd-Fe-B; Permanent magnet; Coercivity; Grain boundary; Atom probe tomography; NUCLEATION CONTROLLED MAGNETS; PERMANENT-MAGNETS; MAGNETIZATION REVERSAL; PARTICLE-SIZE; POWDER; DISPROPORTIONATION; HYDROGENATION; DESORPTION; DEPENDENCE;
D O I：
10.1016/j.scriptamat.2011.05.006
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The microstructure of high-coercivity Nd-Fe-B sintered magnets with a grain size of about 1 mu m, which was processed by helium jet milling and the pressless sintering process, was studied by scanning electron microscopy, transmission electron microscopy and atom probe tomography. The high coercivity can be attributed to a similar microstructure that is five times smaller than that of conventional sintered magnets. Initial magnetization curves showed a two-step magnetization process, suggesting that the grain boundary phase causes a pinning force. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：396 / 399
页数：4
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