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烧结NdFeB磁体热压变形后富Nd相的显微组织
引用本文:杨森,宋晓平,王献辉,孙占波.烧结NdFeB磁体热压变形后富Nd相的显微组织[J].中国有色金属学报,2001,11(2):244-247.
作者姓名:杨森  宋晓平  王献辉  孙占波
作者单位:西安交通大学 材料科学与工程学院,
基金项目:国家自然科学基金资助项目(59671018)
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-Dd和Nd2Fe17两相组成,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Nd2Fe15Al2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。

关 键 词:NdFeB磁体  富Nd相  晶间合金化  磁性能  显微组织  烧结磁体
文章编号:1004-0609(2001)02-0244-04
修稿时间:2000年5月11日

Intergranular microstructure of Nd-rich phase of sintered NdFeB magnets after thermal extruding
YANG Sen,SONG Xiao-ping,WANG Xian-hui,SUN Zhan-bo.Intergranular microstructure of Nd-rich phase of sintered NdFeB magnets after thermal extruding[J].The Chinese Journal of Nonferrous Metals,2001,11(2):244-247.
Authors:YANG Sen  SONG Xiao-ping  WANG Xian-hui  SUN Zhan-bo
Abstract:The microstructure of intergranular Nd-rich phase of sintered NdFeB magnets has been studied by means of thermal extruding. After thermal extruding Nd2Fe17B7 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 Nd2Fe17 phase, which approaches to eutectic structure of binary Nd-Fe alloy. After adding element Al, Nd2Fe15Al2 phases segregate near to the grain boundary of the magnetic Nd2Fe14B phase, which leads to the improvement of coercivity of magnets.
Keywords:NdFeB magnets  Nd  rich phase  magnetic properties
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