Analysis of thermal stress in the TiC/Ti3AlC/Ti3Al three-phase composites

According to the microstructure of TiC/Ti3AlC/Ti3Al three-phase composites, a four-layer thermal stress model was proposed in this paper, and the expression of thermal stress is deduced. Based on the three-phase model, the thermal stresses of TiC/Ti(3)AIC/Ti3Al three-phase composite were calculated. The results indicate that the normal stresses and tangential strain of each phase and corresponding interface stain decrease comparing to those of TiC/Ti3Al two-phase alloys, which can prevent the interface from disjointing. Although the tangential pressing stresses is a little small in inter-phase Ti3AlC, the tangential pressing stresses in Ti3Al matrix can be decreased significantly, which can prevent the Ti3Al matrix from being tensile damaged. The mechanical properties of Ti3Al-C alloys with dual structure particles were measured. The inter-phase Ti3AlC can make the microhardness and elastic modulus change gradually which is helpful to transfer of stress.