TEM Investigation on Ceramic Strengthening NiAl-Based Composite Prepared by Thermal Explosion and Hot Extrusion

摘要

The NiAl-based composite strengthened by TiC and Al_2O_3 was synthesized by thermal explosion and hot extrusion. Its microstructure and mechanical properties were investigated by XRD, OM, TEM and HRTEM. The results reveal that the NiAl-TiC-Al_2O_3 composite can be densified with less porosity. The NiAl grain of the composite matrix has been well refined by the TiC and Al_2O_3 particles. In addition, stacking fault and microtwins formed in some TiC particles and thin amorphous layer also observed along NiAl/TiC interface. Moreover Ti_2AlC particle with intergrowth TiC plate inside is formed along the NiAl grain boundary.