原位合成TiC和TiB增强钛基复合材料的微观结构与力学性能

利用钛与Ｂ４Ｃ之间的自蔓延高温合成反应经普通的熔钐工艺原位合成制备了ＴｉＣ、ＴｉＢ增强的钛基复合材料。光学金相、ＥＰＭＡ、ＴＥＭ和Ｘ射线衍射的研究结果表明：存在匠两种不同形状的增强体，即短纤维状ＴｉＢ晶须和等轴、近似等轴状ＴｉＣ粒子。ＴｉＢ、Ｔｉ基体界面洁净，没有明显的界面反应，而ＴｉＣ、Ｔｉ基体界面有非化学配比的ＴｉＣ过度层存在。由于增强体承受载荷，基体合金晶粒细化以及高密度位错的存在，制备钛基

Microstructure and mechanical properties of in situ synthesized (TiB TiC)/Ti matrix composites

TiB and TiC reinforced Ti matrix composites have been produced in situ by common casting and hot forging technology. The results of optical microscopy, EPMA, TEM and XRD show that there are two reinforcements with different shapes, namely, short fibre TiB and equiaxed or near equiaxed TiC particles. TiB whiskers were made to align along the hot forging direction after hot forging. The interface between reinforcements and Ti matrix alloy is clean. There isn't interface reaction between TiB and Ti matrix alloy, while there is non stoichiometric annuli in interface between TiC and Ti matrix alloy. The mechanical properties at room and elevated temperature of Ti matrix composites have been improved at large scale due to the following reasons: TiB whiskers and TiC particles undertaking load, refining of titanium matrix alloy'grains and high density dislocation in Ti matrix alloy.