Abstract
Two novel laminated Ti–TiBw/Ti composites, consisting of pure Ti layers with different thicknesses of 200μm and 400μm and TiB whisker reinforced Ti (TiBw/Ti) composite layers with a constant thickness of 200μm, were successfully fabricated by diffusion welding. Herein, the individual thickness of the two layers can be controlled accurately through raw Ti sheets and TiBw/Ti composite sheets. The two prepared laminated composites exhibit higher ultimate tensile strength (625MPa and 569MPa, respectively) and higher elongations (19.0% and 27.5%, respectively) compared with pure Ti material (546MPa, 17.5%). The superior ductility is mainly attributed to the necking delaying effect and delamination shielding effect. Fracture characteristics show that many tunnel cracks were formed in TiBw/Ti composite layer and shear bands were presented in the pure Ti layer. Moreover, interfacial delamination was formed between Ti layer and TiBw/Ti composite layer interface, which is beneficial to toughen the laminated composites.
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