Abstract
Abstract Mg-rare earth (RE) alloys have been under rapid development as a novel class of lightest alloys. The ballistic performance of Mg-RE alloy plates, especially intermediate-thickness plates, is of particular interest for applied and basic studies, but rarely investigated. We investigate high-speed perforation of intermediate-thickness Mg6Gd3Y0.5Zr plate with ballistic experiment, microstructure characterization, and finite element simulation. The projectile is a stainless steel (SS304) sphere, the Mg6Gd3Y0.5Zr target plate is 20-mm thick, and the impact velocity is 1612 m s−1. High-speed photography captures target deformation and damage along with ejecta. Postmortem material characterizations indicate plastic deformation, localized shearing and spallation damages, and melting and re-solidification of the target. The finite element simulation can well reproduce the target behaviors and projectile residual velocity observed in the experiment. A multi-stage analysis on the histories of instantaneous projectile velocity and target rear face pressure reveals the transition of target deformation/damage modes during penetration/perforation. The projectile mainly decelerates during the front half of perforation, while spalling and plugging reduce the ballistic resistance to the projectile movement.
Published Version
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