【摘 要】
：
The crystallization kinetics of amorphous Fe68.5Si13.5B9Cu1Nb3C5 (at. Pct) melt-spun ribbons were studied by the DSC method in the mode of continuous heating. T
【机 构】
：
National Engineering Research Center for Nonferrous Metal Composites,Key Laboratory of Liquid Struct
论文部分内容阅读
The crystallization kinetics of amorphous Fe68.5Si13.5B9Cu1Nb3C5 (at. Pct) melt-spun ribbons were studied by the DSC method in the mode of continuous heating. The apparent activation energy Ep1 and Ep2 (373.07±7.92 and 518.75±21.35 k J/mol, respectively) derived from the Kissinger plots were calculated by the peak temperatures Tp1,Tp2, which display a strong dependence on the heating rates. The crystallization behavior during isothermal annealing at 823 K for 1, 5, 10 h and 973 K for 5 h were investigated using XRD and TEM. The results show that crystallization behavior becomes completely different from that of FINEMET. It is not bcc α-Fe (Si) but metastable fcc γ-Fe (Si)that participates in the first crystallization step combining the appearance of Fe23B6 and Nb2B. Therefore, the addition of C promotes the combination of Fe and B. Fe3.5B is participated in the second step together with the disappearing of Fe23B6, which indicates that transition Fe23B6→Fe3.5B+Fe2B presumably happens. Γ-Fe (Si) with peculiar stability cannot transform into nano-sized α-Fe (Si) crystals until the amorphous ribbons were annealed for 5 h at 973 K.
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