中文摘要：

采用旋转盘式间接杆-杆型冲击拉伸装置（SHTB）对颗粒度分别为2，5μm和20μm的三种91%（质量分数）细化钨合金材料在动态冲击载荷作用下的力学性能进行了实验研究，分析了三种钨合金在应变率为0.001，200，500s^-1时动态力学性能，给出了颗粒度大小与材料屈服强度的关系；采用扫描电子显微镜（SEM）对动态拉伸实验中回收的试件断口进行断口分析，研究钨合金在不同应变率状态下材料的破坏特征，在动态拉伸载荷作用下钨合金材料呈现出一种混合破坏模式包括钨颗粒的劈裂以及颗粒与基体界面的开裂。

英文摘要：

Dynamic tension tests were conducted by employing SHTB to study the fracture behavior of 91% （mass fraction） tungsten alloy with three kinds of grain sizes of 2, 5μm and 20μm. The dynamic mechanical properties of tungsten alloys under different strain rates were analyzed. The effects of grain size on the mechanical characteristics were discussed. By adopting SEM, the fracture section of the specimen after the dynamic tension tests were scanned and the fracture modes of the tungsten alloys under different strain rates were investigated.