The microstructure and mechanical properties of explosively welded TA1/3A21 composite plate were studied. The results suggested that the bonding interface had a wavy appearance, and two types of Ti–Al solid solutions were found in the crest region. Most of the interfaces had a thin diffusion layer with a thickness of approximately 3 µm, and no brittle intermetallic compounds were formed. The interface of the explosively welded TA1 Ti/3A21 Al composite plate exhibited reliable shear and bending properties. The propagation of the facile cracks initiated at the Ti–Al solid solution/Al interface, and the Ti–Al solid solution region at the vortex could be terminated by the Ti matrix. In addition, the complex bonding interface structure inhibited the crack propagation along the interface.
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