Mechanical Property and Fracture Characteristic of Ti–Cu–Ni–Al_x Bulk Metallic Glasses under Different Strain Rates

抄録

In this study, a Ti-based bulk metallic glass (BMG) was used to investigate the influence of the addition of Al on mechanical properties and glass forming ability (GFA). The experimental results show that the plastic flow stress value of the alloy will change with the change of strain and strain rate. As the strain rate increases, the plastic flow stress value increases. The fracture surface of the specimens can be observed through a scanning electron microscope. It can be seen that the fracture surface has the characteristics of a dimple-like structure. The appearance, distribution density, and grain density of the vein-like structure depend on the strain rate and the addition of the Al element.

From the Figure, it can be seen that there exists two stress during the fracture process, one is tensile stress and the other shear stress. Therefore, when specimen are subjected the compressive load, it will fracture along the maximum shear stress plane, leading the final shear failure and produce the shear zone. When specimen are fractured and separated, it will suffer the tensile stress and produce the tensile zone.