Dynamic Compression Behavior of Ti/TiAl3/Al Metal Intermetallic Laminates

The present study evaluates the dynamic compression behavior of Ti/TiAl3/Al metal intermetallic laminates (MILs) at a strain rate of 1000 s–1 and the corresponding failure phenomenon. Ti/Al MILs prepared at 575 °C using vacuum solid-state diffusion bonding process were characterized to possess TiAl3 intermetallic phase along the Al/Ti interfaces. Two different sample orientations termed parallel and perpendicular with respect to the loading directions were used to evaluate the anisotropy in the compression property. The TiAl3 volume fraction and loading direction had a greater influence in deciding the compression property of the MILs. The total volume fraction of TiAl3 in the MIL at the end of 48 h annealing was 745 µm and the corresponding compression strength was evaluated to be 970 MPa. In both loading directions, a higher TiAl3 volume fraction contributes to the high compressive strength of the MILs, but brittle crack formation in the TiAl3 phase leads to failure. The MILs behaved anisotropic to the two different loading directions, and the parallel tested samples possess higher strength. The work hardening behavior of the MILs largely depends on the loading direction and ductile metallic phase.