Effect of in-situ synthesized TiB₂ on microstructure and mechanical property of Al/TiB₂-SiC interpenetrating phase composites

Al/TiB2-SiC composites were prepared based on TiB2-SiC porous ceramic preforms. The advantages of this work characterized by the in-situ synthesized TiB2 in preforms which directly formed interconnected pores as well skeletons during one-step sintering. By controlling volume fraction, it is possible to tailor preform structures so determine and mechanical properties composites. with 20 vol% addition achieved highest porosity, biggest pore size, but lowest flexural strength. composite showed optimum properties. improvement was mainly ascribed additions dense fully infiltrated Al. This special interpenetrating structural feature also constituted an improved toughness through complex crack patterns such branching, bridging, deflection.