采用反应自生法制备了 Ti CP增强钛合金基复合材料 ,并通过 XRD、SEM对复合材料的相组成、微观组织进行了仔细的分析 .结果表明 :Ti- 6Al- 1 .8C合金中 Ti C的形态有树枝状晶和短棒状两种形态 .在对 Ti C形成机制的分析中认为 ,树枝状 Ti C是包晶反应之前过冷熔体中 ,以连续生长方式自由生长而成的初生 Ti C,而短棒状 Ti C则是包晶反应后在β- Ti的内部生核并长大而成 . TiCP reinforced titanium alloy matrix composites were prepared by reaction spontaneous method, and the phase composition and microstructure of the composites were analyzed by XRD and SEM.The results show that TiC in Ti-6Al-1.8C alloy Morphology dendrites and short rod two forms.In the analysis of the formation mechanism of Ti C, that dendritic Ti C is peritectic reaction before the supercooled melt, the continuous growth of free growth from the primary Ti C , While the short rod-like TiC nucleates and grows inside the β-Ti after peritectic reaction.