透射电镜观察到非晶Fe65Cr18Mo2Si1B14和Fe62Cr18Mo2Si1B17基体中分布着纳米级颗粒状的非晶第二相．磁测量与Mossbauer谱显示非晶样品由少量铁磁相与顺磁基体相组成，并表现出单畴颗粒的高矫顽力.快淬过程中早期过冷液体里硼的偏聚导致非晶合金中非晶第二相的形成及脆化．
A comprehensive examination was made on the structures and properties of Fe65Cr18Mo2Si1B14 and Fe62Crl8Mo2Si1B17 single-roll quenched ribbons. TEM revealed par-ticle-like amorphous second phase with size of tens of nanometer distributed in amorphous matrix, amount of which increased with boron concentration. Correspondingly, magnetic analysis and M6ssbauer spectrum indicated that the ribbons were composed of phases with different magnetic properties. A small amount of magnetic phase was detected to be dispersed in paramagnetic matrix and has high coercive force as single-domain particle. The quenched ribbons were brittle before annealing. A conclusion can be drawn that the boron segregation in eariy undercooled liquid during quenching results in the formation of amophous second phase, which brittlized the quenched ribbons.
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