高速冲击下块体金属玻璃动力学响应的实验研究

摘要

块体金属玻璃具有极高的力学强度，存在潜在的军事应用价值，实现其应用的关键在于认识材料在高应变率下的动力学行为特性。为此，利用飞片驱动速度可达3．5 km/s 的电炮加载装置，对一种新制备的锆基块体金属玻璃的动力学响应进行了实验研究。实验中，基于高精度DPS激光干涉仪测得的样品/窗口界面粒子速度波剖面，获得了新材料在应变率约为106/s下的冲击响应特性参数。在加载压力15～25GPa 范围下，确定的 Hugoniot弹性极限约为2．4GPa，线性拟合得到的冲击 Hugoniot关系为Ds＝（4．4±0．1）＋（0．58±0．08）up。%As a novel material with high strength,bulk metallic glass received concern of many researchers all over the world.For potential military applications,it was important to un-derstand the dynamic response of this material under high strain rate.To this end,Electric Gun was chosen to study dynamic response of a newly prepared Zr-based bulk metallic glass.In the E-lectric Gun experiments,the velocity of electric explosion driven plastic flyer in 0.5 mm thick-ness could reach 3 .5 km/s.Based on bulk metallic glass sample/window interface particle veloci-ty profiles measured by high resolution DPS laser interferometer,two important dynamic behav-iors were obtained under high strain rate about 106/s.In a shock pressure range of 15~25GPa, the Hugoniot elastic limit was determined to be about 2 .4GPa,and the shock wave velocity (Ds) vs.particle velocity (up)Hugoniot data were linearly fitted by Ds= (4.4±0.1)+(0.58±0.08)up.