利用铜模铸造方法制备了Ni45Ti23Zr15Si5Pd12块状非晶合金, 采用扫描差热分析(DSC)和X射线衍射(XRD)对该块状非晶合金的晶化动力学 行为进行了研究. 结果表明: Ni45Ti23Zr15Si5Pd12 块状非晶样品的晶化过程为多阶段晶化, 主要晶化过程的Avrami指数大于3.0, 为三维形核长大过程; 随着晶化体积分数的增加, 剩余非晶的晶化激活能 增大, 合金热稳定性增加; 原子尺寸差异以及各原子间大的负混合焓是 合金具有高的热稳定性的主要原因.
The crystallization kinetics of the Ni45i23Zr15Si5Pd12 alloy has been investigated by DSC and XRD. The process of crystallization is multi-stage proceeding. The isothermal activation energy obtained from Arrhenius equation increases with the process of crystallization. Based on the JMA equation, the average Avrami exponent for the main crystallization process is larger than 3.0, indicating the crystallization to be a three-dimensional nucleation and growth. The large atomic size difference and negative heats of mixing increase the thermal stability of the Ni-based amorphous alloy.
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