高速冲击下块体金属玻璃动力学响应的实验研究

Experimental study on dynamic response of bulk metallic glass under high velocity impact

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3．5km／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10^5／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 understand 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 Electric Gun experiments, the velocity of electric explosion driven plastic flyer in 0.5 mm thickness could reach 3.5 km/s. Based on bulk metallic glass sample/window interface particle velocity profiles measured by high resolution DPS laser interferometer, two important dynamic behaviors 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.