A hat-shaped specimen of TC4/TA2 titanium alloy composite plate was fabricated using vacuum hot-rolling and machining processes. The microstructure and failure behavior of the TC4/TA2 composite hat-shaped specimen under dynamic shear deformation were investigated through split Hopkinson pressure bar experiments and microstructural characterization, with a focus on analyzing the formation mechanism of adiabatic shear bands (ASBs) and the shear strengthening mechanism. The results indicate that, compared to monolithic metals, the TC4/TA2 composite plate forms two distinct ASBs under dynamic shear. The width of the ASBs on the TC4 side gradually decreases along the shear direction, while that on the TA2 side progressively increases. Grain refinement via recrystallization occurs within the ASBs, with grain sizes refined to approximately 1.0 μm in TA2 and 0.6 μm in TC4, and microhardness values of about 290 HV and 430 HV, respectively. Within the ASBs, the grain orientation is primarily . This microstructural heterogeneity leads to the preferential initiation and propagation of microcracks at the interface between the transition zone and ASBs, as well as within the ASBs itself. Notably, the coordinated deformation at the interface of the composite plate provides an effective buffering effect on the shear deformation of the TC4 layer, suppressing crack propagation from the TC4 side to the TA2 side.
Wang et al. (Wed,) studied this question.
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