Abstract：In this paper, the mechanical properties, microstructures and fracture surfaces of TC4 powder titanium alloy prepared by hot isostatic pressing were compared and analyzed, and the effect of oxygen content on its mechanical properties was studied. The results show that the microstructures of TC4 titanium alloys as hot isostatic pressing and annealing have no obvious difference and are lamellar; the oxygen content increases from 0.11% to 0.17%, the strength and plasticity of titanium alloys increase obviously, and the fracture toughness KIC of TC4 titanium alloys decreases from 101 MPa·m1/2 to 95 101 MPa·m1/2; the fracture mechanism of TC4 titanium alloys under room temperature tension is typical microporous aggregation fracture. The mechanism is that cleavage facets appear on the tough section with the increase of oxygen content.
2019, Vol. 29 
