[SY-C13] Symposium C-13

[SY-C13] Mesoscopic studies of slip and twinning processes in hcp polycrystalline materials

Invited

^○Irene Beyerlein¹, Marat Latypov¹, Jason Mayeur, Wyatt Witzen¹, Mitra Taheri², Tresa Pollock¹ (1.University of California at Santa Barbara, United States of America, 2.Drexel University, United States of America)

Under deformation, strain and lattice orientation gradients can develop near crystalline heterogeneities, such as grain boundaries, deformation twins, and voids. These important effects have been studied intensely most often in materials that deform by a single slip mode. In this presentation, we discuss multiscale crystal plasticity modeling efforts to understand the development of lattice orientation gradients induced near and at the boundaries of microstructural defects within crystals of materials with either a BCC or HCP crystal structure. These two material classes commonly deform by multiple slip modes and this distinction is taken into account in the modeling. The results presented in this talk will highlight the effects of microscopic differences in the strengths of these slip modes on the evolution of dislocation density.