Processing and Ballistic Evaluation of Dual-Hardness Titanium Armor
Final rept. Aug 1972-Feb 1974
LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB
Pagination or Media Count:
A program to demonstrate the potential of dual-hardness titanium alloy armor for defeating small-caliber armor-piercing threats was conducted. The armor consisted of either a Ti-3Si-3Fe-0.5N or a Ti-3Si-2Fe-3Mo-0.75 front- face alloy diffusionroll-bonded to a Ti-7Al-2.5Mo back-face alloy. The plates were heat-treated to a hardness level of R sub c 54-59 on the surface of the front face and to R sub c 39-43 on the back face. Screening studies of alloy compositions leading to the selection of the two different front-face alloys are discussed. A materials and process improvement study is described that is designed to improve bond-line strength and overall ballistic performance of the dual-hardness composite. Results of a ballistic evaluation study conducted with 30-cal AP projectiles to determine the effect of variable front-to-rear thickness ratios for areal densities of 6, 8, 10, and 12 lbsq ft are presented. Performance in ballistic tests is correlated with alloy hardness, composition, structure, thickness ratios and areal densities to assess the overall potential of the dual-hardness titanium armor.