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采用反应自生法制备了 Ti C颗粒增强钛合金基复合材料 ,并通过 XRD,SEM对复合材料的相组成和微观组织进行了研究。结果表明 :在 Ti- 6Al- 1 .8C中主要存在 Ti和 Ti C两种相。Ti C以树枝状初生 Ti C和短棒状共晶 Ti C两种形态存在。对 Ti C晶格常数的计算结果表明 ,Ti C的衍射峰存在一定的偏移 ,主要是由于 Ti C中存在 C空位。研究了 C含量对材料组织和 Ti C形貌的影响。结果表明 :C含量对基体组织基本没有影响 ,但是随着 C含量由 1 .98%减少到 0 .39% ,粗大的树枝状 Ti C逐渐消失 ,Ti C以短棒状为主 ,部分呈羽毛状。
TiC particles reinforced titanium alloy matrix composites were prepared by reaction spontaneous method. The phase composition and microstructure of the composites were investigated by XRD and SEM. The results show that there are two main phases Ti and Ti C in Ti-6Al-1. Ti C exists as dendritic primary Ti C and short rod eutectic Ti C. Calculations of the lattice constants of Ti C show that there is a certain shift in the diffraction peak of Ti C, mainly due to the presence of C vacancies in Ti C. The effects of C content on the microstructure and TiC morphology were investigated. The results showed that the content of C had no effect on the microstructure of the matrix. However, as the C content decreased from 1.98% to 0.39%, the coarse dendritic Ti C gradually disappeared. The Ti C mainly consisted of short rods and partly feathery .