摘要
采用液体金属冷却(LMC)的定向凝固技术,研究了在较低晶体生长速度(12 和20 祄/s)条件下得到的Nd13 .5Fe81.5B5永磁合金的磁取向。分析发现,Nd2Fe14B的易磁化轴[001]仍然与柱状晶生长方向垂直,即与其晶体择尤生长方向垂直。在一定的区域内,相邻柱状晶的易磁化轴互相平行,从而组成易磁化轴平行排列的晶粒集团。当晶体生长速度从20μm/s 降低到 12μm/s时,晶粒集团的平均尺寸明显增大,所含晶粒数增加。
Magnetic alignment of Nd13.5Fe81.5B5 directionally solidified at lower crystal growth velocity R, 12, and 20 μm/s, was investigated. The examination of microstructures and magnetic domains showed that the easy magnetization axis [001] of Nd2Fe14B, the magnetic matrix, randomly distributes in the plane perpendicular to the preferential growing direction of Nd2Fe14B crystal. The grain group consists of certain neighboring grains, whose easy magnetization axes are parallel to each other. That is to say, in a group, the plate-like domain walls of Nd2Fe14B grains are parallel to each other, but the domain walls in different grain groups are not parallel. As R is decreased from 20 to 12μm/s, the average area of the groups is enlarged, and the number of grains in each group is increased.
出处
《磁性材料及器件》
CAS
CSCD
2003年第4期1-3,共3页
Journal of Magnetic Materials and Devices
基金
宁波大学科研项目(009-471089
009-471079)
浙江省自然科学基金资助项目(502166)
江西省跨世纪学术带头人资助项(CA99110901)
