Thermoplastic Deformation and Mechanical Properties of Zr-Based Bulk Metallic Glasses

Abstract

The effect of heating and thermoplastic deformation on the fracture stress of Zr 55 Cu 30 Al 10 Ni 5 and Zr 60 Cu 25 Al 10 Ni 5 bulk metallic glass at room temperature (RT) was studied. These metallic glasses were easily crystallized by the influence of heating beyond their upper limit temperature of 685 K and 713 K, respectively. The fracture stress was maintained the strength of material as cast below these temperatures while it decreased easily by crystallization. It was possible to deform these materials below these temperatures. Their strength after thermoplastic deformation depended on the amount of strain, strain rate, and temperature during the deformation. The lower temperature and higher strain rate resulted in high strength after thermoplastic deformation at RT.