Interplay Between Thermodynamic and Kinetic Factors in the Formation of Metastable Phases

为了比较亚稳态相的形成与相关的热力学和动力学模型，对四个合金系统进行了研究。选择了两个显示负生成热的三元体系；这些体系受到来自液体的快速猝灭速率的时间表的影响。观察到的亚稳相的形成与基于连续冷却结晶动力学模型的理论预测进行了比较。两个具有正形成热的二元不混溶合金系统被包括在研究中，试图通过溅射或机械合金化来产生亚稳相。对于这些二元系统，计划了基于对各自的自由能及其随温度的变化的建模而进行的相预测。

Four alloy systems are examined in order to compare the formation of metastable phases with related thermodynamic and kinetic modeling. Two ternary systems are selected that display negative heats of formation; these are subjected to a schedule of rapid quench rates from the liquid. Observed metastable phases that form are compared with theoretical predictions based on a model of continuous cooling crystallization kinetics. Two binary immiscible alloy systems with positive heats of formation are included in the research in an attempt to produce metastable phases by sputtering or mechanical alloying. Phase predictions based on modeling of the respective free energies and their changes with temperature are planned for these binary systems.