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

Abstract

In situ TiC particle, Ti 3 SiC 2 bar and ultrafine Ti 5 Si 3 needle reinforced Ti6Al4V ((TiC+Ti 3 SiC 2 +Ti 5 Si 3 )/Ti6Al4V) composites with a tailored distribution were sucessfully designed and fabricated. The first‐scale tailored architecture of reinforcement is the in situ synthesized Ti 3 SiC 2 bars and near‐equiaxed TiC particles on the network boundary around Ti6Al4V particles. The secondary‐scale architecture is the ultrafine Ti 5 Si 3 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.