Elizabeth Fortin¹, Benjamin Shaffer¹, Saul Opie¹, Pedro D. Peralta¹; ¹Arizona State University

Understanding the evolution of damage and deformation due to spall at grain boundaries (GBs) can provide a basis for connecting micro- to macroscale failure behavior in metals undergoing shocks Bicrystal samples were shock loaded using flyer-plate impacts with pressures ~ 3 to 5 GPa. Pulse duration as well as crystal orientation along the shock direction were varied for a fixed boundary misorientation to determine thresholds for void nucleation and coalescence as functions of these parameters. Samples were soft recovered and cross-sectioned to perform damage characterization using electron backscattering diffraction (EBSD) and Scanning Electron Microscopy (SEM) to gather information on damage characteristics at and around the GBs, with emphasis on void interactions and lattice rotation around boundary and bulk voids. The EBSD and SEM experimental data collected were compared to results from simulations of individual and interacting voids performed using finite element crystal plasticity models, to understand local plasticity effects.