Grain boundary structure and chemistry of Dy-diffusion processed Nd-Fe-B sintered magnets

被引：141
|
作者：
Sepehri-Amin, H. [1 ,2 ]
Ohkubo, T. [1 ]
Hono, K. [1 ,2 ]
机构：
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
[2] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058571, Japan
来源：
JOURNAL OF APPLIED PHYSICS | 2010年 / 107卷 / 09期
关键词：
D O I：
10.1063/1.3351247
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have investigated the microstructure of grain boundary diffusion processed Nd-Fe-B sintered magnets by high resolution scanning electron microscopy, high resolution transmission electron microscopy, and laser assisted atom probe to understand the mechanism of coercivity enhancement. After the vapor coating of Dy to the sintered magnets, the sample were annealed to let it diffuse in the sample through the grain boundary diffusion. The composition of the outer region of the Nd(2)Fe(14)B grains changed to (Nd, Dy)(2)Fe(14)B due to the substitution of Dy for Nd. Excess Nd ejected from the Nd(2)Fe(14)B grains led to the formation of continuous Nd-rich grain boundaries. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3351247]
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