Dynamic compression behavior of multilayered titanium matrix composites

Multilayer structured titanium matrix composites consisting of pure Ti layers and TiB reinforced Ti-6.5Al-2Zr-1Mo-1V (TA15) composite layers were fabricated through powder metallurgy. The mechanical property and deformation behavior of the composite during dynamic compressions (with strain rates similar to 10(3) s(-1)) and quasi-static compression (1 x 10(-3) s(-1)) were investigated. The compressive flow stress was improved by nearly 200 MPa under dynamic conditions compared with the quasi-static one. Both the pure Ti layer and the TiB/TA15 layer were deformed during dynamic compression, but the deformation was non-uniform. The deformation of the pure Ti layer was higher than the TiB/TA15 layer, which resulted in a concentration of strain near the layer interface. In dynamic conditions, increasing strain rate led to TiB multi-fracture and TiB-TA15 matrix decohesion. In both the dynamic and quasi-static conditions, {10 (1) over bar2} and {11 (2) over bar2} twins were generated in the pure Ti layer, while the formation of the {11 (2) over bar2} twin was inhibited in the TA15 matrix. Compared with the quasi-static loading condition, dynamic compression promoted the formation of the {11 (2) over bar1} twin in both the pure Ti layer and the TA15 matrix.