用单辊快淬法制备Fe74Nb6-xYxB20(x=3 at％、4 at％、5 at％)非晶合金,取不同的温度对合金热处理,利用差热分析仪(DTA)、X射线衍射仪(XRD)、透射电子显微镜(TEM)、振动样品磁强计(VSM)研究了合金的非晶形成能力、晶化过程和磁性能.结果表明,添加微量Y元素提高了合金的非晶形成能力,当Y含量为5 at％时,Fe74Nb1 Y5 B20非晶合金过冷液相区具有最大值、△Tx=63℃.Fe74Nb6-xYxB20(3 at％、4 at％、5 at％)合金的晶化过程为:非晶→非晶+α-Fe+ Fe23B6+ Fe2B→α-Fe+Fe23B6+ Fe2B.随着退火温度的升高,3种合金Fe74 Nb6-xYxB20(x=3 at％、4 at％、5 at％)饱和磁化强度Ms变化趋势是一致的,在670℃退火后3种合金MS均达到最大、分别为128、122、134 A.m2· kg-,矫顽力Hc为2.96、3.12、3.36 kA.m-1,在750℃退火后,Hc快速增大.
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