Evolution of crystallographic texture and strength in beryllium

The evolution of the dynamic mechanical behavior and crystallographic texture in polycrystalline beryllium with different initial textures was measured and compared to a polycrystalline plasticity model. The split-Hopkinson pressure bar compression behavior and the activity of deformation mechanisms were found to be highly dependent on the initial texture and the loading orientation. Neutron diffraction measurements of the bulk texture as a function of strain were made at the Manuel Lujan Jr. Neutron Scattering Center. The activation of deformation twinning at high strain rates in beryllium was observed to cause both anisotropy in the mechanical behavior and rapid evolution of the texture compared to slip deformation alone. A visco-plastic self-consistent (VPSC) polycrystalline plasticity model was used to closely simulate the texture and flow strength evolution by accounting for contributions from both slip deformation and twinning mechanisms