Ti₄₅Zr₃₅Cu₅Ni₁₅块体非晶合金动态压缩性能研究

The Ti₄₅Zr₃₅Cu₅Ni₁₅ bulk metallic glass with a small amount of nanocrystalline was prepared by copper mould injection casting. The dynamic compression properties of the alloy was investigated with the split Hopkinson pressure bar (SHPB) under high strain rates at room temperature (25 ºC), -80 ºC and liquid nitrogen temperature (-196 ºC). The morphology characteristics of the compression fracture were observed by field emission scanning electron microscope (SEM) with energy spectrum. Comparative analysis shows that the material exhibits maximum dynamic compressive strength and plastic deformation at -80 ºC, and the maximum compressive strength reaches 2378 MPa when the plastic strain reaches 12%, which exhibits excellent mechanical strength and toughness. Furthermore, uncommon profuse wrinkles are also found on the fracture surface. The mechanical properties of the materials are similar at room temperature and liquid nitrogen temperature. The maximum compressive strength is around 1600 MPa while the plastic strain reaches about 8%, and the river pattern on the fracture surface of the material could also be observed. In addition, the material shows strain softening at room temperature and strain rate strengthening to a certain extent at low temperature.