预加热金属Hugoniot参数和界面温度的联合测试技术

A Combined Technique for Measuring Hugoniot and Interfacial Temperature of Preheating Metals

发展了一种可用于轻气炮压缩实验的电阻丝预加热装置和高温靶实验测试技术,通过微热电偶丝实时测量了预加热金属的初始温度,并利用非接触式光纤探针技术实现了Hugoniot参数和界面温度的同时测量。常温下实测的金属Ta的冲击波速度D和粒子速度u与文献报道的冲击实验数据相符,而初温773K金属Ta的(D,u)数据则低于采用Mie-Grüneisen状态方程计算的结果;实测的界面温度与Lindeman熔化线和第一性原理的计算结果均符合较好。实验结果表明,所设计的高温靶装置及相关实验诊断技术是可行并有效的,为今后开展材料动态性能的温度效应研究提供了一种有效的技术途径。

Research of dynamic respond properties for metal at initial high-temperature condition is very important to develop the universal equation of state.Thus,resistance-wire preheating apparatus over initial temperature range of 300-800 K has been built up by our group in light-gas-gun experiments,and a non-contact pyrometer diagnostic technique was developed to perform simultaneous measurements of the shock-Hugoniot and the interfacial temperature on a preheated metal.Examples for measuring dynamic respond properties of tantalum are presented.The measured data for shock velocity versus particle velocity at initial temperature of 300 K is in agreement with previous shock compression data,while the data of 773 K lies below the theoretical Hugoniot that was calculated based on the principal Hugoniot.The obtained interfacial temperatures are in agreement with the melting points that shocked from the ambient conditions and ab initio results.It indicates that our target-preheating apparatus and non-contact pyrometer diagnostic technique is a viable approach to study the temperature effects on shock response of metals.