及其微观组织
(佳木斯大学 材料学院， 佳木斯 154007)
摘 要: 采用直接加入TiC粉的方法制备了原位自生TiC增强钛基复合材料， 此法与国内研究者常用的加入石墨粉的方法相比， 制备的复合材料成分准确， 易于控制。 制备的复合材料由Ti和TiC相组成， 其中TiC为初生树枝状和短棒状共晶组成。 TEM研究发现： 还存在0.3~0.6μm的规则块状TiC， 多分布在晶界上； TiC颗粒与基体界面干净、无反应层， 基体中存在较多的位错， 且位错线上存在析出物。
关键字: 自生复合材料; 钛合金; 制备; TiC形貌; 组织
（Materials College, Jiamusi University, Jiamusi 154007, China）
Abstract:The in-situ TiC particles reinforced Ti-based composite was fabricated by direct addition of TiC power. Using this way the composition of composite is accurate and controllable than direct addition of C power during fabricating composite. The composite consists of Ti and TiC phases, among them the dendrite TiC and short-bar shape TiC are primary and eutectic phases respectively. TEM observe results indicate that there also have blocky TiC with size of 0.3~0.6μm and they distribute at grain boundary. The interface between TiC particle and matrix is clear and with no reaction existing. At the mean time, a number of dislocations can be found in the matrix and carbides precipitate from dislocations line.
Key words: In-situ composite; titanium alloy; fabrication; TiC morphology; microstructure
