Microstructure and Room Temperature Compression Properties of TiAl Matrix Composites Reinforced by Ti‐6Al‐4V Particles

TiAl alloys possess the benefits of low density and high strength‐to‐weight ratio and are suitable for use as a structural component in aero‐engines. However, the limited ductility and inherent brittleness of TiAl alloys restrict their wider application at room temperature. Herein, Ti‐6Al‐4V/TiAl matrix composites are fabricated via powder metallurgy method using Ti‐6Al‐4V and Ti‐48Al‐2Cr‐2Nb prealloyed powders for the raw materials. The experimental results indicate that Ti‐6Al‐4V particles are uniformly distributed in the TiAl matrix. The compression tests show that the Ti‐6Al‐4V/TiAl matrix composites have a compressive strength at room temperature of 2226 ± 3 MPa and a fracture strain of 51.3 ± 1%. Compared to Ti‐48Al‐2Cr‐2Nb alloys, the strength and fracture strain of the composites are increased by 259 MPa and 10%, respectively. During the deformation process, the synergistic deformation of Ti‐6Al‐4V particles is the main reason to enhance fracture strain of Ti‐6Al‐4V/TiAl matrix composites. The flow deformation and high‐density microcracks of TiAl matrix and Ti‐6Al‐4V particles are the main reason for improving the compressive strength of Ti‐6Al‐4V/TiAl matrix composites.