Understanding microstructural effects of spallation in additively manufactured Ti-5Al-5V-5Mo-3Cr towards the development of a two-phase microstructurally aware model.

Additive manufactured Ti-5Al-5V-5Mo-3Cr (Ti-5553) is being considered as an AM insertion material for engineering applications because of its superior strength properties compared to other titanium alloys. Here we describe the constitutive behavior as a function of strain rate for as-built and annealed Ti-5553. Spallation experiments were conducted at three impact velocities and materials characterization including computed tomography, electron backscatter diffraction, and scanning electron microscopy was conducted on the samples pre and post shot. Inconsistencies in the Hugoniot elastic limit were observed for as-built Ti-5553 indicating a phase change during compression. Preliminary CTH modeling of the dynamic experiments is described. Finally, we discuss a novel approach to enhance existing peridynamics research code Emu and SPPARKS Monte Carlo (MC) capabilities to include multiphases and demonstrate a preliminary simulation of Ti-5553 microstructure with the integration of alpha phase.