采用铜模吸铸法制备了Fe64-xCoxNd7B25Nb4(x =0 ～40)块体合金,利用X射线衍射仪(XRD)、差示扫描量热仪(DSC)和振动样品磁强计(VSM)研究了该体系合金的非晶形成能力、晶化过程和磁性能.结果表明:Fe64-xCoxNd7 B25 Nb4(x=O～40)块体合金具有良好的非晶形成能力.在Co含量为0at％ ～ 40at％范围内,合金基本为非晶态.该系合金铸态时为软磁性,晶化处理后则表现为硬磁性.随着Co含量的不同,合金的晶化行为和晶化后的产物及对应的磁性能均有明显的变化.不含Co元素时,合金发生两级晶化反应；晶化过程中出现了亚稳相Fe23 B6,随着退火温度的升高,Fe23B6分解为Fe3B和α-Fe相.添加Co元素后,合金只发生一级晶化反应.Co含量为20at％的合金在1 003 K退火后,内禀矫顽力高达1 164 kA/m.
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