The effect of microstructure on tensile properties, deformation mechanisms and fracture models of TG6 high temperature titanium alloy

▶ Fine α hindered dislocation slip and crack nucleation and decreased crack propagation velocity. ▶ α lamellae decided the type and amount of slip system and the crack propagation. ▶ Fine α lamellae promoted the deformation coordination and the start of new slip systems. ▶ The fracture model of the samples with bimodal microstructure was not sensitive to α lamellae. ▶ Fracture model with the bimodal microstructures was a mixture fracture at room temperature.