Enhanced magnetic properties in Nd-Fe-B magnets prepared by spark plasma sintering via die-upsetting process
Enhanced magnetic properties in Nd-Fe-B magnets prepared by spark plasma sintering via die-upsetting process
复制标题
通过镦粗工艺放电等离子烧结制备的 Nd-Fe-B 磁体增强磁性能
DOI：
10.1016/s1002-0721(10)60517-0
复制
发表时间：
2011-07-01
影响因子：
4.9
通讯作者：
Liu Ying
中科院分区：
文献类型：
--
作者：
Hu Zhihua;Chu Linhua;Liu Ying
研究了放电等离子烧结Nd-Fe-B磁体在不同镦锻工艺下的磁性能和显微组织。结果表明，在680 ℃时，镦锻程度为60%，磁取向度为0.84时，镦锻Nd-Fe-B磁体的磁性能最佳。显微组织表明，粗晶粒主要发生在某些地区，并没有观察到异常晶粒生长的主要领域内的排列整齐的晶粒。当变形温度为650 ℃时，模具顶锻过程中存在许多小球状颗粒，这些颗粒堆积在一起，没有对齐。当变形温度从650 ℃升高到680 ℃时，这些小的球形晶粒长大并排列，这可以改善模具镦粗Nd-Fe-B磁体的晶体学排列。
The magnetic properties and microstructure of Nd-Fe-B magnets prepared by spark plasma sintering with different die-upsetting processes were investigated. The results showed that the optimum magnetic properties of die-upset Nd-Fe-B magnets were obtained at 680 degrees C when the die-upset level was 60%, and the degree of magnetic alignment was 0.84. The microstructures showed that the coarse grains occurred predominantly within certain areas, and abnormal grain growth was not observed within the major areas of well-aligned grains. There existed many small spherical grains, which stacked together and were not aligned during die upsetting when the deformation temperature was 650 degrees C. These small spherical grains grew up, and were aligned when the deformation temperature increased from 650 to 680 degrees C, which could improve the crystallographic alignment of die-upset Nd-Fe-B magnets.