Design, fabrication and mechanical properties of in situ synthesized titanium matrix composites

摘要

Titanium matrix composites are in situ synthesized by common casting and hot working technology. The combination of reinforcements is optimized, and TiB, TiC and rare earth oxides are chosen to strengthen titanium matrix composites. The orientation relationships between reinforcements and matrix are examined, and the orientation relationships between reinforcements are revealed. Microstructure of titanium matrix composites with different reinforcement volume fractions is studied. Mechanical property tests show titanium matrix composites with reinforcements volume fraction of 2.8% exhibit better high temperature tensile properties, and the strengthening mechanism can be summarized as two reasons: the load bearing effect of TiB short fibers and the dispersion strengthening effect of TiC/La_2O_3 particles.