| The focus of this research is on the analysis of the structure, performance, and formation of ASB's that are associated with plug formation and penetration in impacted Ti-6A1-4V targets.; A series of electron beam, cold hearth, single melt Ti-6A1-4V plates (nominally 2.5 cm thick) impacted by 2 cm diameter, 4340 steel projectiles (with 54 g nominal mass) at velocities ranging from 0.633 to 1.027 km/s were sectioned along the impact axis and examined.; Results showed that ASBs formed in a direction perpendicular to the projectile axis. Near ballistic limit velocities, the shear bands propagate towards the rear of the target in the direction of the impact axis where they coalesce and grow to facilitate plug formation and projectile perforation by dynamic recrystallization (DRX) within the shear bands allowing for solid-state flow. (Abstract shortened by UMI.)... |
