卸载熔化状态铁/蓝宝石界面温度测量及其相变动力学研究

本文主要是研究金属铁经历冲击-卸载到熔化压力区，其内部发生熔化相变时，铁/蓝宝石界面的辐亮度和温度随时间演化特性，发现辐亮度随时间持续增强而界面却经历了一个慢降温过程，该特征与无相变或瞬时相变的热传导模型结论不一致，即无熔化相变或瞬时相变时，界面温度是一个稳定值.本文结合熔化相变动力学模型与热传导方程对实验现象给出一种理论解释.模型计算所给出的温度历史与观测结果一致，由此可以校对其它测量或者计算熔化温度的方法和模型计算的结果，并能够初步限定出该压力下铁的熔化成核速率和径向长大速率.

Temperature measurement and phase transition dynamics at the interface of melting iron/sapphire under shock unloaded

The history of radiation and temperature at the interface of iron/sapphire under released to the melting area is researched in this paper. It is found that the radiation decrease with time but the interface temperature undergo a slowly cooling process which is different from the previous researches. Basing on the phase transition dynamics and the heat conduction equation, we give a reasonable explain. The history of the interface temperature depends on the melting speed of iron and the heat conduction. The simulation signal can accord with the experimental signal by choosing some parameters, by which the range of the nucleation rate and the nucleus growth rate can be confirmed.