Effect of Sintering Temperature on Microstructure and Mechanical Properties of Al_2O_3/TiAl In Situ Composites

摘要

Al_2O_3/TiAl composites were successfully fabricated by hot-press-assisted exothermic dispersion method with powder mixtures of Ti, Al, TiO_2 and Cr_2O_3 as raw materials. The effect of sintering temperature on the microstructures and mechanical properties of Al_2O_3/TiAl composites has been investigated. The results show that the Rockwell hardness and density of the composites increased with increasing sintering temperature. But the flexural strength and fracture toughness peaked at 825 MPa and 7.29 MPa-m~(1/2), respectively, when the sintering temperature reached to 1300 ℃.