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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Isochronal crystallization kinetics of Cu_(60)Zr _(20)Ti_(20) bulk metallic glass
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Isochronal crystallization kinetics of Cu_(60)Zr _(20)Ti_(20) bulk metallic glass

机译：Cu_（60）Zr _（20）Ti_（20）大块金属玻璃的等时结晶动力学

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摘要

Isochronal crystallization kinetics of Cu_(60)Zr _(20)Ti_(20) bulk metallic glass has been investigated by differential scanning calorimetry. By means of the Kissinger, Ozawa, Kempen, Matusita and Gao methods, average effective activation energies for the first and second crystallization reactions in Cu_(60)Zr_(20)Ti _(20) are calculated to be about 375 ± 9 and 312 ± 11 kJ mol~(-1), respectively, which are smaller than the values deduced from isothermal experiments. Meanwhile, average Avrami exponents, 3.0 ± 0.1 and 3.4 ± 0.2, for two crystallization reactions in isochronal anneals, differ from the value about 2.0 in isothermal anneals. The nonidentity of the Avrami exponents and effective activation energies may be contributed to different crystallization mechanisms and the nature of non-isokinetic between isochronal and isothermal experiments. The values of frequency factor k _0 for the first and second crystallization reactions of Cu _(60)Zr_(20)Ti_(20) are (1.7 ± 0.3) × 10~(24) and (7.0 ± 0.8) × 10~(18) s~(-1), respectively, and the large value of k_0 has been discussed in terms of the atomic configuration and interaction.
机译：通过差示扫描量热法研究了Cu_（60）Zr _（20）Ti_（20）大块金属玻璃的等时结晶动力学。通过Kissinger，Ozawa，Kempen，Matusita和Gao方法，计算出Cu_（60）Zr_（20）Ti _（20）中第一和第二次结晶反应的平均有效活化能约为375±9和312分别为±11 kJ mol〜（-1），小于等温实验得出的值。同时，等时退火中两次结晶反应的平均Avrami指数为3.0±0.1和3.4±0.2，与等温退火中的平均Avrami指数约为2.0。 Avrami指数和有效活化能的不确定性可能会导致等时实验和等温实验之间不同的结晶机理和非等速动力学性质。 Cu _（60）Zr_（20）Ti_（20）的第一和第二次结晶反应的频率因子k _0的值为（1.7±0.3）×10〜（24）和（7.0±0.8）×10〜（ 18）分别是s〜（-1）和k_0的大值，这是根据原子构型和相互作用进行的。

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