【摘要】 通过研究Nd4.5Fe76.5-xGaxCo1.0B18(x=0-0.6,(原子分数, ％))纳米复合粘结磁体的微结构和矫顽力,发现Ga在晶界富Nd相中的分布高于(Fe,Co)3B和Nd2(Fe,Co)14B相,矫顽力随Ga含量的增加是先下降然后增加,当Ga含量较低时(x=0.2),磁体的矫顽力随退火时间的变化关系出现一个明显的峰值,这些现象可用合金的微结构和纳米双相复合磁体的交换耦合作用来解释.更多还原

【Abstract】 The microstructure and coercivity of nanocomposite Nd4.5Fe76.5-xGaxCo1.0B18 (x=0-0.6 (atomic fraction, %)) bonded magnets were studied. The results show that addition of small amount of Ga in Nd4.5Fe76.5-xGaxCo1.0B18 makes the grains finer and more uniform. A notable peak of coercivity was observed on the variation curve of coercivity with annealing time when Ga content is low (x=0.2). This phenomenon could be explained by the microstructure and the exchange coupling interaction of two-phase nanocomposite.更多还原