Coercivity and Grain Boundary Morphology in Nd–Fe–B Sintered Magnets
Coercivity and Grain Boundary Morphology in Nd–Fe–B Sintered Magnets
复制标题
Nd-Fe-B 烧结磁体的矫顽力和晶界形貌
DOI：
10.1143/jjap.29.2737
复制
发表时间：
1990
期刊：
影响因子：
--
通讯作者：
R. Shimizu
中科院分区：
文献类型：
--
作者：
Y. Tsubokawa;S. Hirosawa;R. Shimizu
用400KV高分辨电子显微镜研究了Nd15Fe77B8烧结永磁体的微观结构。为了更全面地了解Nd2Fe14B烧结磁体中的矫顽力与微结构的关系，研究了870K等温热处理对Nd2Fe14B界面微观结构变化的影响。在烧结态样品中可以观察到沿晶界的原子尺度台阶。热处理后台阶消失，形成非常平坦的界面。因此，晶界的这种原子尺度取向是影响烧结NdFeB磁体矫直力的因素之一。
The microstructure of Nd15Fe77B8 sintered permanent magnets has been investigated under a 400 kV high-resolution transmission electron microscope. With particular concern about the microstructural changes in the Nd–Nd2Fe14B interfaces, the effects of isothermal heat treatment at 870 K have been studied for a more comprehensive understanding of the coercivity-microstructure relationship in the Nd–Fe–B sintered magnets. The atomic-scale steps along the grain boundary can be observed in as-sintered samples. The steps disappear after heat treatment, and very flat interfaces are formed. This atomic-scale alignment at the grain boundary, therefore, is one of the factors affecting the coercivity of Nd–Fe–B sintered magnets.