B effects on crystallization and magnetic properties of Pr_(9.44)Fe_(90.56-x)B_x(x=7.16, 4.76) nanocomposite magnets

查看全文 作　　者：Caiyin YOU Na TIAN Zhengxin LU Liling GE Xiaotian [1]JING 机构地区：[1]School of Materials Science and Engineering, Xi an University of Technology, Xi an 710048, China 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2010年第23卷第5期,共6页 基　　金：supported by the High Educational Talents Grant,Xi an University of Technology;Shaanxi Provincial Project of Special Foundation of Key Disciplines;Education Department of Shaanxi Provincial Government 摘　　要：Magnetic properties, phase evolution and microstructures of Pr9.44Fe90.56?xBx (x=7.16 and 4.76) nanocomposite magnets have been investigated. Both as-spun ribbons exhibit two-step demagnetization curves, indicating the feature of partial crystallization. By using di?erential scanning calorimeter (DSC) measurements, remained amorphous phase of ribbon with x=7.16 shows a higher crystallization temperature. At optimum annealing temperature of 650 ?C for 10 min, better magnetic properties, Mr=1.01 T, jHc=796 kA/m and (BH)max=136 kJ/m3 were obtained in the sample with x=4.76. Transmission electron microscopy (TEM) observation confirms that the sample with x=4.76 possesses much finer grain size, which causing a better exchange coupling between soft and hard magnetic grains. 关 键 词：纳米复合磁体 透射电子显微镜 扫描量热法 磁学性质 微观结构 退磁曲线 结晶特征 结晶温度