采用原位自生的方法制备了TiC颗粒增强的TiC/Ti-6Al-4V复合材料。将锻造后的钛基复合材料在700℃、995℃以及1020℃进行热处理,获得具有不同基体微观组织的复合材料,研究基体微观组织对钛基复合材料拉伸性能以及断裂韧性的影响。结果表明,初始α相的含量及其尺寸对TiC/Ti-6Al-4V复合材料的断裂韧性影响较大,初始α相体积分数为20%时,复合材料拉伸性能最好,抗拉强度和伸长率分别为1057.5 MPa、19.95%;同时具有优良的断裂韧性。 TiC particles reinforced TiC / Ti-6Al-4V composites were prepared by in-situ method. The as-cast titanium matrix composites were heat-treated at 700 ℃, 995 ℃ and 1020 ℃ to obtain composites with different matrix microstructures. The effects of matrix microstructure on the tensile properties and fracture toughness of Ti-based composites were studied. The results show that the initial α phase content and its size have a great influence on the fracture toughness of TiC / Ti-6Al-4V composites. When the initial α phase volume fraction is 20%, the tensile properties of the composites are the best, The length rates are 1057.5 MPa and 19.95%, respectively. At the same time, they have excellent fracture toughness.