摘要：
（Fe3Co）80-x Nb4Al2Si4B10Smx、Fe57-xCo18Nb4Al2Si4B15Smx和Fe42.5Co42.5Nb7-xB8Smxamorphous alloy ribbons with the same thickness were prepared by vacuum arc melting and melt spinning. The influence of Sm addition on the amorphous forming ability and phase composition of as-spun alloys were studied by XRD, DTA. The results showed that, the addition of small amount of Sm improved the amorphous forming ability and made the phase composition of as-spun alloys simpler. And with the increasing of Sm contents, the intensity of the peaks corresponding to the formation of （CoFe） 3Nb phase, （FeCo） 3 B phase and B6 （FeCo）23 phase decreased and the precipitated of α - （FeCo） phase decreased apparently, while the amorphous forming ability of alloys increased.
