摘要
采用热压变形法对NdFeB磁体晶间富Nd相的显微组织进行了研究。实验结果表明 ,NdFeB磁体经真空热压变形后 ,富Nd相不再平均地分布在磁体晶间 ,而是聚集成团块状或从磁体边缘渗出。显微组织分析表明 ,富Nd相主要是由α Nd和Nd2 Fe17两相组成 ,与Nd Fe合金的共晶组织成分接近。对于晶间添加Al元素的磁体 ,Al溶入晶间形成Nd2 Fe15Al2 相弥散地分布在晶界上 ,这有益于磁体矫顽力的提高 ;对于晶间添加Cu元素的磁体 ,晶间没有发现有新相产生。
The microstructure of intergranular Nd rich phase of sintered NdFeB magnets has been studied by means of thermal extruding. After thermal extruding Nd 2Fe 17 B 7 magnets, Nd rich phases are not distributed in the intergranular region on the average and a lot of Nd rich phases aggregate or separate from the magnet. The results show that the microstructure of Nd rich is consisted of α Nd phase and Nd 2Fe 17 phase, which approaches to eutectic structure of binary Nd Fe alloy. After adding element Al, Nd 2Fe 15 Al 2 phases segregate near to the grain boundary of the magnetic Nd 2Fe 14 B phase, which leads to the improvement of coercivity of magnets. [
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2001年第2期244-247,共4页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目 !(5 96 710 18)
