Evaluation of dynamic performance and ballistic behavior of Ti-5Al-5Mo-5V-3Cr-1Zr alloy
(State Key Laboratory for Fabrication and Processing of Nonferrous Metals,
General Research Institute for Nonferrous Metals, Beijing 100088, China)
General Research Institute for Nonferrous Metals, Beijing 100088, China)
Abstract: Terminal ballistic tests using 7.62 mm armor-piercing incendiary (API) projectiles were performed to evaluate the resistance to penetration of Ti-5Al-5Mo-5V-3Cr-1Zr (Ti-55531) alloy. The dynamic properties were determined by a split Hopkinson pressure bar (SHPB) test system. Ti-55531 plates were subjected to two kinds of heat treatments, leading to the formation of high-strength and high-toughness plates. The results of SHPB test exhibit that the maximum impact absorbed energy of the high-strength plate at a strain rate of 2200 s-1 is 270 MJ/m3; however, the maximum value for the high-toughness plate at a strain rate of 4900 s-1 is 710 MJ/m3. The ballistic limit velocities for the high-strength and high-toughness plates with dimensions of 300 mm×300 mm×8 mm are 330 and 390 m/s, respectively. Excellent dynamic properties of Ti-55531 alloy correspond to good resistance to penetration. The microstructure evolution related to various impact velocities are observed to investigate the failure mechanism.
Key words: Ti-5Al-5Mo-5V-3Cr-1Zr alloy; dynamic property; split Hopkinson pressure bar; adiabatic shear band; ballistic behavior; ballistic limit