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利用快冷-退火-量热法探索了Cu_(46)Zr_(42)Al_7Y_5金属玻璃条带在升温和等温退火过程中的热力学变化.实验结果表明,Cu_(46)Zr_(42)Al_7Y_5金属玻璃条带的升温热流曲线上存在3个放热峰.分析发现,第1个放热峰表征了金属玻璃条带的Sub-Tg弛豫行为;第2个放热峰是加热过程中团簇有序化放热现象与玻璃转变吸热现象叠加的结果;第3个放热峰对应金属玻璃的晶化过程.通过计算玻璃转变、团簇有序化及晶化过程的激活能,研究非等温退火后各激活能的变化,从能量角度证明了加热过程中发生团簇有序化现象的合理性.基于元素混合焓分析发现,锆-钇原子之间与铝-钇(或铜-钇)原子之间混合焓的巨大差异极有可能是团簇有序化现象发生的诱导因素.本文为揭示相分离和团簇运动机理提供了新思路和新途径.
The thermodynamic changes of the Cu 46 Zr 42 Al 7Y 5 metal glass ribbon during annealing and isothermal annealing were investigated by means of rapid cooling-annealing-calorimetry.The experimental results show that the Cu_ (46) Zr_ (42) Al_7Y_5 metallic glass There are three exothermic peaks on the curve of temperature rise and heat flux.The first exothermic peak characterizes the Sub-Tg relaxation behavior of the metallic glass ribbon, and the second exothermic peak is the temperature of the cluster The third exothermic peak corresponds to the crystallization process of metallic glass.Through the calculation of the glass transition, the order of the clusters and the activation energy of the crystallization process, the non-isothermal Based on the analysis of elemental enthalpy, it was found that the interaction between the zirconium - yttrium atoms and the aluminum - yttrium (or copper - yttrium) It is most likely that the large difference in the enthalpy of mixing between atoms can be an inducing factor for the orderly clustering of clusters.This paper provides new ideas and new ways to reveal the mechanism of phase separation and cluster motion.