2, University of Illinois at Urbana-Champaign, Urbana, Illinois, United States
We have studied the statistics of shear banding events during mechanical deformation of metallic glasses using low noise and high temporal resolution data. These statistics are often measured at macroscopic length scales, yet they provide a tool with which we can probe the microscopic deformation mechanisms. A simple mean field model of slipping weak spots predicts that the statistics of these intermittent plastic events should show tuned critical behavior across length scales. The tuning parameters include the stiffness of the mechanical test system, the applied strain rate, temperature, specimen size, the applied stress level, and the extent of weakening in the specific material. In this presentation, we will demonstrate the effects of some of these tuning parameters using experimental results from compression testing and nanoindentation and for several different Zr-based alloys with the key finding being that the tuning parameters only affect the cutoff of the scaling behavior; the power law exponents are unchanged.