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首页> 外文期刊>Journal of Materials Science >Crystallization kinetics of the Fe40Ni40P14B6 metallic glass in an extended range of heating rates
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Crystallization kinetics of the Fe40Ni40P14B6 metallic glass in an extended range of heating rates

机译：在延长范围的加热速率下Fe40Ni40P14B6金属玻璃结晶动力学

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摘要

The effect of heating rate (in the range of 0.083-3.333Ks(-1)) on the parameters of thermal stability and crystallization kinetics of the Fe40Ni40P14B6 metallic glass has been investigated by differential scanning calorimetry and X-ray diffraction. An analytical model of glass crystallization describing the homogeneous nucleation rate, the velocity of interface-limited growth, the number of crystal volume density in crystallized samples as well as the crystallization kinetics at constant rate heating is presented. A modified procedure of estimation of thermodynamic and kinetic parameters governing the rate of crystal nucleation and growth based on the use of the measured heating rate-dependent variations of the volume fraction crystallized and the average grain size is proposed. The values of the effective diffusivity have been estimated by the Kissinger-like isoconversional method accounting the contribution of both the free energy difference and the specific interfacial nucleus-melt energy changes estimated from the structural data. It has been shown for the first time that the shapes of the non-isothermal experimental kinetic crystallization curves measured at the heating rates1.333Ks(-1) are well described by the approximate analytical equation and the values of the Avrami exponent lowering from 5.5 to 2.3 with the heating rates increasing have been estimated. The evaluated ranges of the nucleation rate (1.4x10(16)-2.5x10(17)m(-3)s(-1)) and growth velocity of crystals (2.05x10(-9)-3.0x10(-7)ms(-1)) in Fe40Ni40P14B6 glass at temperatures from 653 to 714K are in reasonable agreement with the experimental data. Possible variations of the established eutectic crystallization mechanism revealed by changes of the Avrami exponent with the heating rate increasing are discussed.
机译：通过差示扫描量热法和X射线衍射研究了对Fe40Ni41b6金属玻璃的热稳定性和结晶动力学参数的加热速率（0.083-3.333kks（-1））的影响。呈现均匀成核速率，界面限制生长的速度，结晶样品中的晶体体积密度的速度以及恒定速率加热下的结晶动力学的分析模型。提出了一种改进的热力学和动力学参数估计，用于基于使用测得的加热速率依赖性变化和平均晶粒尺寸的测量的加热速率依赖性变化的晶体成核和生长速率。依据从结构数据估计的自由能差和特定的界面核 - 熔体能量变化的贡献估计了有效扩散率的值。首次示出了第一次在加热速率下测量的非等温实验动力学结晶曲线（-1）测量的非等温实验动力学结晶曲线的形状通过近似分析方程和从5.5降低的AVRAMI指数的值良好地描述2.3估计了加热率的增加。核切割速率的评估范围（1.4×10（16）-2.5x10（17）m（-3）s（-1））和晶体的生长速度（2.05x10（-9）-3.0x10（-7）ms （-1））在FE40NI40P14B6中，在653至714K的温度下与实验数据合理一致。讨论了通过与加热速率增加的Avrami指数的变化显示的已建立的共晶结晶机制的可能变化。

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