Effects of lanthanum substitution on microstructures and intrinsic magnetic properties of Nd-Fe-B alloy  

作　　者：李智 刘卫强 查善顺 李玉卿 王云峤 张东涛 岳明 张久兴 

机构地区：[1]College of Materials Science and Engineering, Beijing University of Technology

出　　处：《Journal of Rare Earths》2015年第9期961-964,共4页稀土学报（英文版）

基　　金：supported by the National High-Tech Research and Development Program of China(2012AA063201);National Natural Science Foundation of China(51001002,51371002);the Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions,Technology Foundation for Selected Overseas Chinese Scholar of Beijing

摘　　要：（Ndl-xLax）30Fe69B （x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6） alloys were prepared by inducting melting, and the effect of substitution of La for Nd on their microstructure and intrinsic magnetic properties were investigated. With the increase of La content, Curie tem- perature （Tc） decreased from 582.4 to 557.4 K, saturation magnetization （Ms） decreased from 1.59 to 1.37 T, and anisotropy field （HA） decreased from 5394 to 3911 kA/m. However, the reductions of the intrinsic magnetic properties were relatively gentle as La content increased, which meant that the intrinsic magnetic properties still had the potential to fabricate permanent magnets. Moreover, further microstructure observations showed that La tended to diffuse into the Nd-rich grain boundary phase instead of main phase during the substitute process. Such aggregation behavior was beneficial to fabricating La containing magnet with high Ms.（Ndl-xLax）30Fe69B （x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6） alloys were prepared by inducting melting, and the effect of substitution of La for Nd on their microstructure and intrinsic magnetic properties were investigated. With the increase of La content, Curie tem- perature （Tc） decreased from 582.4 to 557.4 K, saturation magnetization （Ms） decreased from 1.59 to 1.37 T, and anisotropy field （HA） decreased from 5394 to 3911 kA/m. However, the reductions of the intrinsic magnetic properties were relatively gentle as La content increased, which meant that the intrinsic magnetic properties still had the potential to fabricate permanent magnets. Moreover, further microstructure observations showed that La tended to diffuse into the Nd-rich grain boundary phase instead of main phase during the substitute process. Such aggregation behavior was beneficial to fabricating La containing magnet with high Ms.

关 键 词：NdFeB alloy： La substitution： microstructure： intrinsic mamaetic orooerties： rare earths 

分 类 号：TG146.45[一般工业技术—材料科学与工程]