Preparation of In-Situ Reaction Particle-Reinforced Titanium Matrix Composites Layers by Friction Surfacing

In this paper, by drilling holes in Ti-6Al-4 V rods and adding aluminum powder to the holes, particle-reinforced Ti-6Al-4 V matrix composites layers were successfully prepared through friction surfacing. In the composites layers, Al₃Ti and AlTi₃ particle-reinforced are generated through in-situ reaction between titanium and aluminum. The microstructure, mechanical properties and corrosion resistance are evaluated between adding and no-adding aluminum powder before and after friction surfacing. The results show that adding aluminum powder not only ameliorates the formability of the surfacing layers, reduces the peak temperature and increases the cooling rate to refine the grains, but also directly synthesizes Al₃Ti and AlTi₃ reinforced particles through in-situ reaction, which enhances hardness but reduces corrosion resistance of the surfacing layers. The study provides a new method of preparing particle (Al₃Ti and AlTi₃)-reinforced Ti-6Al-4 V matrix composites layers, which has great application value and development prospect in aircraft and aerospace engines.