Effect of Si element on improving the oxidation resistance of hybrid (Ti₅Si₃ + TiC) particles reinforced Ti6Al4V matrix composites

This study focused on the objective to reveal the effect of Si element on the oxidation behaviors of (Ti₅Si₃ + TiC)/Ti6Al4V composites. The oxidation testing at 700 °C and 800 °C for 100 h, respectively, indicated that the oxidation resistance of (Ti₅Si₃ + TiC)/Ti6Al4V composites were improved obviously. The two aspects contributed to the improvement: 1) the oxide scale was densified owing to that the SiO₂ sealed the voids among TiO₂ scale; 2) with the densification, the oxide scale of composites bonded well with the substrate. The oxidation behaviors of composites were hardly affected by TiC particles.