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利用覆盖渣技术在非真空条件下成功制备出了直径为3mm的Zr55Ni5Al10Cu30块体非晶合金。采用差示扫描量热法(DSC),将Johnson-Mehl-Avrami理论拓展应用于非晶合金的非等温晶化过程研究。结果表明,Zr55Ni5Al10Cu30块体非晶合金的连续升温晶化过程Avrami指数及形核率随升温速率的升高而呈下降趋势,同时随晶化过程进行呈先增加后减小的规律。Avrami指数最大值出现在晶化体积分数0.3～0.4之间,在低升温速率下Zr55Ni5Al10Cu30块体非晶合金部分晶化过程出现三维形核界面控制长大的形式。
The overlay slag technology was used to successfully prepare Zr55Ni5Al10Cu30 bulk amorphous alloy with a diameter of 3mm under non-vacuum conditions. Differential scanning calorimetry (DSC) was used to extend Johnson-Mehl-Avrami theory into non-isothermal crystallization of amorphous alloys. The results show that the Avrami index and nucleation rate of Zr55Ni5Al10Cu30 bulk amorphous alloy decrease with increasing heating rate and increase first and then decrease with the crystallization process. The maximum Avrami index appeared in the range of 0.3 ~ 0.4. Under the condition of low heating rate, the morphology of the Zr55Ni5Al10Cu30 bulk amorphous alloy was controlled by the three-dimensional nucleation interface.