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

• Published in: Journal of rare earths Vol. 33; no. 9; pp. 961 - 964
• Main Author: 李智 刘卫强 查善顺 李玉卿 王云峤 张东涛 岳明 张久兴
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2015
• Subjects: intrinsic magnetic properties; La substitution; microstructure; NdFeB alloy; rare earths; 内禀磁性; 各向异性场; 居里温度; 微结构; 结构观察; 钕铁硼合金; 镧; 饱和磁化强度; NdFeB alloy; La substitution; microstructure; intrinsic magnetic properties; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(14)60512-3

（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.