Crystallization Behavior of C-containing FINEMET Amorphous Alloy Melt-spun Ribbon

材料科学技术（英文）, 2005, 21(1): 135-139.

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1.National Engineering Research Center for Nonferrous Metal Composites, General Research Institute for Non-ferrous Metals,Beijing 100088, China

2.Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University,Jinan 250061, China

3.Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

4.Institute of Metal Physics, Ukrainian Academy of Sciences, UA-03680 Kiev, Ukraine

5.National Engineering Research Center for Nonferrous Metal Composites, General Research Institute for Non-ferrous Metals,Beijing 100088, China

基金项目: 国家自然科学基金(50271037)

Crystallization Behavior of C-containing FINEMET Amorphous Alloy Melt-spun Ribbon

Keywords： Amorphous

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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Crystallization Behavior of C-containing FINEMET Amorphous Alloy Melt-spun Ribbon

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