Titanium matrix composites (TMC) have potential applications in the aerospace industry because of their excellent performance. The comprehensive performance of TMC mainly depends on the matrix, reinforcement and interface characteristics. Hence, this study discussed the knowledge of microstructure-property relationships in detail. Crack-free high-mass-proportion TiCp/Ti6Al4Vcomposites were successfully prepared by directed energy deposition (DED). As the TiCp mass fraction increasing from 0 to 50%, the quantity of primary TiC and unmelted TiC (UMT) increased. Meanwhile, the refined α-Ti in the composites had a relatively weak texture. In addition, the interface between primary TiC and α-Ti was a semi-coherent interface, exhibiting a $\left[11\stackrel{\mathrm{-}}{2}0\right]$ α-Ti // [110]TiC, $\left(\stackrel{\mathrm{-}}{1}100\right)$ α-Ti // $\left(\stackrel{\mathrm{-}}{1}11\right)$ TiC orientation relationship, which facilitated the heterogeneous nucleation of Ti and improved bonding of primary TiC with the matrix. With the increase in microhardness taking the form of a cubic function, the wear mechanism was found to transform from abrasive wear to slight delamination wear. Due to the fact that both UMT and primary TiC bonded well with Ti64 matrix, they shared partial friction to protect matrix from severe abrasion, resulting in an excellent wear resistance of composites. Moreover, the thermal conductivity of 50% TiCp/Ti6Al4V was 9.063 $\text{W∙}{\text{m}}^{\text{-1}}\text{∙}{\text{K}}^{\text{-1}}$, which was nearly 26.5% higher than that of Ti6Al4V. Owing to the premature cracking of brittle UMT and dendritic TiC, the tensile strength and elongation of the composite with 50% TiCp were 515.5 MPa and 1.83%, which decreased by 45.8% and 78.8%, respectively. Adding a high proportion of TiCp can significantly improve the hardness and wear resistance of TMC, whereas it is detrimental to the tensile performance of TMC. The study have significant implications for the design of novel TMC, particularly for the aerospace industrial applications.

钛基复合材料（TMC）由于其优异的性能而在航空航天工业中具有潜在的应用。TMC的综合性能主要取决于基体，增强材料和界面特性。因此，本研究详细讨论了微观结构与属性之间的关系。通过定向能量沉积（DED）成功制备了无裂纹的高比例TiCp / Ti6Al4V复合材料。随着TiCp的质量分数从0％增加到50％，初级TiC和未熔融TiC（UMT）的数量增加。同时，复合物中的精制α-Ti具有相对较弱的织构。此外，初级TiC和α-Ti之间的界面为半相干界面，表现出$\left[11\stackrel{\mathrm{--}}{2}0\right]$ α-Ti// [110] TiC， $\left(\stackrel{\mathrm{--}}{\mathrm{1个}}100\right)$ α-Ti// $\left(\stackrel{\mathrm{--}}{\mathrm{1个}}11\right)$TiC取向关系，促进了Ti的异质成核并改善了初级TiC与基体的键合。随着以立方函数形式的显微硬度的增加，发现磨损机理已从磨料磨损转变为轻微的分层磨损。由于UMT和初级TiC与Ti64基体均能很好地粘合，因此它们共享部分摩擦力以保护基体免受严重磨损，从而使复合材料具有出色的耐磨性。此外，TiCp / Ti6Al4V 50％的导热系数为9.063$\text{W∙}{\text{米}}^{\text{-1}}\text{∙}{\text{ķ}}^{\text{-1}}$，比Ti6Al4V高出近26.5％。由于脆性UMT和树枝状TiC的过早开裂，TiCp为50％的复合材料的拉伸强度和伸长率分别为515.5 MPa和1.83％，分别下降了45.8％和78.8％。添加高比例的TiCp可以显着提高TMC的硬度和耐磨性，但不利于TMC的拉伸性能。该研究对新型TMC的设计具有重要意义，特别是对于航空航天工业应用。