Effect of niobium substitution on microstructures and thermal stability of TbCu7-type Sm-Fe-N magnets

查看全文 作　　者：Guiyong [1]Wu;Hongwei [1]Li;Dunbo [1]Yu;Kuoshe [1]Li;Wenlong [1]Yan;Chao [1]Yuan;Liang [1]Sun;Yang [1]Luo;Kun [1,2]Zhang

机构地区：[1]National Engineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous Metals,Grirem Advanced Materials Co.Ltd.,Beijing 100088,China;[2]Key Laboratory of Microgravity(National Microgravity Laboratory),Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Journal of Rare Earths》索引2018年第36卷第3期,共6页

基　　金：Project supported by the National Natural Science Foundation of China(51401028) 摘　　要：This paper reports crystal structures, magnetic properties and thermal stability of TbCu7-type Sm_(8.5)Fe_((85.8-x)Co_(4.5)Zr_(1.2)Nb_x(x = 0-1.8) melt-spun compounds and their nitrides, investigated by means of X-ray diffraction, vibrating sample magnetometer, flux meter and transmission electron microscope. It is found that the lattice parameter ratio c/a of TbCu_7-type crystal structure increases with Nb substitution, which indicates that the Nb can increase the stability of the metastable phase in the Sm-Fe ribbons. Nb substitution impedes the formation of magnetic soft phase a-Fe in which reversed domains initially form during the magnetization reversal process. Meanwhile, Nb substitution refines grains and leads to homogeneous micro structure with augmented grain boundaries. Thus the exchange coupling pining field is enhanced and irreversible domain wall propagation gets suppressed. As a result, the magnetic properties are improved and the irreversible flux loss of magnets is notably decreased. A maximum value 771.7 kA/m of the intrinsic coercivity H_(cj) is achieved in the 1.2 at% substituted samples.The irreversible flux loss for 2 h exposure at 120 ℃ declines from 8.26% for Nb-free magnets to 6.32% for magnets with 1.2 at% Nb substitution. 关键词：SM-FE-N 热稳定性磁铁微观结构类型流动损失水晶结构电子显微镜

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Effect of niobium substitution on microstructures and thermal stability of TbCu7-type Sm-Fe-N magnets

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