热变形工艺对纳米结构Nd-Fe-B磁体磁性能及其微观结构的影响
Effect of Die-upset Process on Magnetic Properties and Microstructure of Nanostructure Nd-Fe-B Magnets
赵睿1
作者信息
- 1. 国家知识产权局专利局专利审查协作北京中心 北京 100190
- 折叠
摘要
本文研究了热变形工艺对各向异性磁体磁性能及其微观结构的影响，结果发现，800°C为最佳热变形温度。热变形磁体c轴沿压力方向的取向排列程度在压下率为75%时达到饱和。热变形速率同样影响模压磁体的磁性能，最大磁能积在应变率?=1×10-2 s-1时达到最大值。微观结构分析发现，变形量为60%的磁体不仅具有异常长大晶粒（2000 nm）团簇还存在大量未参与变形的等轴晶粒，变形量为75%的磁体形成了较好的晶体取向，而当变形量超过80%时，磁体内片状晶粒变得取向混乱，导致晶体织构变差。
Abstract
The effects of the deformation parameters on magnetic properties and microstructure of nanostructure Nd-Fe-B magnets were studied.Deformation temperature 800 °C proves to be suitable for deformation of Nd-Fe-B magnets.The amount of c-axis alignment along the press direction seems to be saturated at deformation ratio of 75%.Magnetic properties are also related to strain rate,and maximum energy product is attained at an optimum strain rate of ?=1×10-2 s-1.Microstructure analysis showed that a good crystal alignment is obtained in the magnets with deformation ratio of 75%.
关键词
纳米结构Nd-Fe-B磁体/热变形/微观结构Key words
nanostructure Nd-Fe-B magnets/die-upset/microstructure引用本文复制引用
出版年
2014
NETL
NSTL
万方数据