采用铜模吸铸法制备出厚度为0.8 mm的片状Fe68Nd5Zr2Y4B21大块非晶合金.利用X射线衍射(XRD),差热分析(DTA)和振动样品磁强计(VSM)研究了Fe68Nd5Zr2Y4B21大块非晶合金在铸态和不同温度退火后的磁性能.结果表明,Fe68Nd5Zr2Y4B21大块非晶合金在铸态下为软磁性.合金晶化退火后,磁性能转变为硬磁性,得到了块状的纳米晶复合永磁材料.合金硬磁性的产生是由于合金晶化后产生了Nd2Fe14B硬磁性相和α-Fe,Fe3B软磁性相,软、硬磁相间产生了较强的交换耦合作用而造成的.这一方法为制备块体纳米晶复合永磁材料提供了一种新的手段.
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