Dynamic deformation and fracture behavior of 3D-net SiC/Zr-based amorphous matrix composites

Dynamic deformation and fracture behavior of 3D-net SiC/Zr-based amorphous matrix composites at room temperature and various strain rates in compression was investigated by means of the split Hopkinson pressure bar (SHPB). The phase structure and failure surfaces were identified by scanning electron microscopy (SEM). It was found that, the dynamic compressive strength increases with the increase of strain rate. The mode of failure of the composites is a mixture combining splitting and shear fracture. 3D-net SiC exhibits typical cleavage fracture, and inhomogeneous flow deformation of the amorphous alloys occurs leaving complex fracture surfaces. Under higher shock loading (strain rate > 10⁴ s^-1), substantive elongated ridge-like structure (melted belts) were observed on the fracture surface of Zr-based amorphous alloy. The observed numerous liquid droplets and melted belts on the fracture surface demonstrated that the adiabatic heating exerts a significant effect on the fracture behavior of the amorphous alloys.