Abstract
Ti/Al laminated sheets were prepared by hot pressing pure Ti and Al foils at 630 °C/20 MPa for different times. The thickness of TiAl3 layers increased, and the elongation of the Ti/Al laminated sheet decreased with the hot-pressing time, where the 15 min-hot-pressed sheets showed the most extensive elongation (135% at 600 °C). The crack initiation and propagation behavior of the 15 min-hot-pressed sheets were investigated by the tensile test with different strains. When the testing temperature was between room temperature (RT) and 400 °C, the cracks in TiAl3 layers were parallel to each other and perpendicular to the tensile direction. The size and amounts of cracks increased with the strain. At 600 °C, the parallel cracks appeared after 70% deformation, while at 100% strain, the TiAl3 layer thickness increased significantly, accompanied by many disordered and discontinuous cracks. The 15 mins-hot-pressed sheet shows excellent gas bulging formability, where the height to radius ratio reached 0.9. The improved sheet formability is because the cracks were filled and healed by the newly formed TiAl3 phase during deformation at 600 °C. The TiAl3 layer, therefore, was maintained for a longer time before rupturing, which greatly improved the coordination deformation ability of various layers.
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