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Spallation Behaviour and Mechanism of Laser Irradiated TC4 Titanium Alloy
B-T. Li, H-B. Yao, N. Fan and P-Y. Wei

Spallation behaviour of TC4 titanium alloy under laser irradiation was investigated in our work. Here we present numerical and experimental study methods including X-ray diffraction (XRD) and a scanning electron microscope (SEM) with the particular laser shock conditions. Experiments have been manipulated by laser pulses with reconfigurable laser parameters of thin foils of TC4 titanium alloy. The experimental results show the spallation behaviour on the surface of TC4 titanium alloy, which reveals the underlying relation between the dynamic failure of materials and the laser parameters. The spallation mechanism of TC4 titanium alloy were determined by fitting the numerical simulations to the experimental data. The results could have important implications for the modification of TC4 titanium alloy .

Keywords: Femtosecond laser, ultrafast laser, TC4 titanium alloy, spallation, residual stress, failure analysis, surface, shock waves

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