Effect of hot deformation temperature on the magnetic and mechanical properties of Nd–Fe–B magnets prepared by spark plasma sintering
Effect of hot deformation temperature on the magnetic and mechanical properties of Nd–Fe–B magnets prepared by spark plasma sintering
复制标题
DOI：
10.1016/j.jmmm.2010.08.040
复制
发表时间：
2011
影响因子：
2.7
通讯作者：
Zu-E. Hu;Ju-Fen Li;L. Chu;L. Ying
中科院分区：
文献类型：
--
作者：
Zu-E. Hu;Ju-Fen Li;L. Chu;L. Ying
研究了不同热变形温度下 Nd-Fe-B 磁体的磁性能和机械性能。结果表明，Nd-Fe-B磁体在700℃时获得了最佳的磁性能和机械性能以及最高的晶体排列，并分析了可能的原因。显微组织表明，650℃时未观察到异常晶粒长大；存在许多小的球形晶粒，这些小晶粒在镦锻过程中并不对齐。晶粒的平均尺寸和粗晶粒的体积分数随着变形温度的升高而增大。粗大晶粒在模具镦锻过程中不排列，并且随着变形温度的升高，不排列区域扩大。
The magnetic and mechanical properties of Nd–Fe–B magnets at different hot deformation temperatures have been investigated. The results showed that the optimum magnetic and mechanical properties and the highest crystallographic alignment of Nd–Fe–B magnets were obtained at 700°C, and the possible reasons were analyzed. The microstructures show that abnormal grain growth is not observed at 650°C; there exist many small spherical grains, and these small grains do not align during die upsetting. The average size of the grains and the volume fraction of coarse grains increase with increase in deformation temperature. The coarse grains do not align during die upsetting, and the non-alignment regions enlarge with increase in deformation temperature.