The effect of different surface states on the dynamic and static mechanical properties of Ti80 alloy

The tensile, impact and fatigue tests of Ti80 alloy samples with different surface states were carried out. Combined with the analysis results of digital image correlation method and scanning electron microscope, the mechanical behavior of Ti80 alloy under dynamic and static loading was studied. The results show that the tensile strength of Ti80 alloy surface polished and deep notch samples was larger than that of surface polished samples. The tensile strength of prefabricated crack samples decreased obviously, and the elongation after fracture decreased with the decrease of surface quality and the increase of notch depth. The impact absorbed energy of samples with different surface states decreased significantly with the decrease of surface quality and the increase of notch depth. The fatigue performance of Ti80 alloy was very sensitive to the surface state of the sample. The surface grinding scratches and small notches would significantly reduce the fatigue life of the material. The mechanical properties of samples with different surface states were more sensitive to the dynamic loading process.