In Situ Synthesis of (TiC + Ti₃SiC₂ + Ti₅Si₃)/Ti6Al4V Composites with Tailored Two-scale Architecture

In situ TiC particle, Ti₃SiC₂ bar and ultrafine Ti₅Si₃ needle reinforced Ti6Al4V ((TiC+Ti₃SiC₂+Ti₅Si₃)/Ti6Al4V) composites with a tailored distribution were sucessfully designed and fabricated. The first-scale tailored architecture of reinforcement is the in situ synthesized Ti₃SiC₂ bars and near-equiaxed TiC particles on the network boundary around Ti6Al4V particles. The secondary-scale architecture is the ultrafine Ti₅Si₃ needles precipitated in intergranular β phase of center Ti6Al4V matrix particle. The results showed that the two-scale tailored architecture of different reinforcements can significantly improve strength remained with moderate ductility of the composites.