Failure Mechanisms of Ti-Al_3Ti Metal-Intermetallic Laminate Composites

摘要

Ti-Al_3Ti Metal-Intermetallic Laminate (MIL) composites were fabricated by vacuum hot pressing. The failure mechanisms of Ti-Al_3Ti MIL composites under the bending load and dynamic loading conditions were analyzed by three points bending test and finite element analysis respectively. The results indicated that the vertical crack existed in the as-deposited state Ti-Al_3Ti MIL composites in the Al_3Ti layers resulted by the thermal residual stress. The three points bending load-displacement curves of Ti-Al3Ti MIL composites embraced a long plateau region, indicating that Ti-Al_3Ti MIL composites have excellent damage tolerance. Ti-Al_3Ti MIL composites under high-speed impact was mostly under the tensile stress. In the high-speed impact period, the transverse, inclined, and vertical cracks which dramatically absorb the projectile kinetic energy formed in Al_3Ti phase.