碳含量对自生TiC_P增强钛基复合材料组织的影响

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。

Effect of Carbon Content on the Microstructure of in situ TiC Particulate Titanium Alloy Matrix Composites

WT5BZ]TiC particulate titanium alloy matrix composites has been produced with different C content by a reaction synthesis and the phase constitution and the microstructure of the composites have been investigated in detail by XRD, SEM The results have shown that Ti 6Al 1 8C is composed of Ti and TiC reinforcements that are of two different morphologies: coarse dendritical primary TiC and short bar shape eutectic TiC The calculated result of the lattice of TiC from XRD pattern shows that there exists diffraction peak shift of TiC that may be due to the vacancies of C in TiC structure The effect of C content on the microstructure and the morphology of TiC has also been studied It has been shown that C content has no influence on the microstructure of matrix But with the decreasing of C content from 1 98% to 0 39%, the coarse dendrite TiC disappears and only short bar shape or plate shape eutectic TiC exists in the composites