中文摘要：

高压高应变率加载下材料的强度研究一直是冲击动力学的一个难题，目前动态载荷下材料的高压强度测量主要是基于平板撞击技术，冲击温升和应变率效应对材料强度的影响难以分离．基于小型磁驱动加载装置CQ-4，开展了磁驱动准等熵压缩下LY12铝的声速和强度测量的实验研究，讨论了考虑加载-卸载过程时磁驱动压缩实验的负载电极设计、实验样品设计、数据处理与分析等内容，并获得了12GPa压力范围沿加载-卸载路径的声速变化和峰值压力点的强度数据．

英文摘要：

It is difficult to fully understand the yield strength of materials under high pressure and high strain rate loading. At present, strength measure under high pressure is mainly based on plate impact technique, in which the effects of strain rate and temperature increase during loading process on material dynamic strength are difficult to resolve. In this work, Lagrangian wave speed and strength of LY12 aluminum under magnetically driven quasi-isentropic compression are studied using CQ-4, a compact strip-line pulsed power generator for isentropic compression experiments. The optimizations of loading electrode and sample configuration, as well as experimental data processing are discussed in detail. Meanwhile, Lagrangian wave speed of LY12 aluminum along loading and unloading path and yield strength under quasi-isentropic compression up to 12GPa are obtained in a good accuracy.