Transition of Temporal Scaling Behavior in Percolation Assisted Shear-branching Structure during Plastic Deformation

This paper explores the temporal scaling behavior induced shear-branching structure in response to variant temperatures and strain rates during plastic deformation of Zr-based bulk metallic glass (BMG). The data analysis based on the compression tests suggests that there are two states of shear-branching structures: the fractal structure with a long-range order at an intermediate temperature of 223 K and a larger strain rate of 2.5 × 10^-2 s^-1; the disordered structure dominated at other temperature and strain rate. It can be deduced from the percolation theory that the compressive ductility, e_c, can reach the maximum value at the intermediate temperature. Furthermore, a dynamical model involving temperature is given for depicting the shear-sliding process, reflecting the plastic deformation has fractal structure at the temperature of 223 K and strain rate of 2.5 × 10^-2 s^-1.