Effects of extrusion deformation on mechanical properties of sub-micron Si 3N 4p/2024 composite

Abstract

Si 3N 4p/2024Al composite was fabricated by squeeze casting method and treated by extrusion deformation. Microstructure analyses indicate that Si 3N 4 particles in the composite are in cylindrical polyhedron shape. Extrusion deformation is beneficial to uniform distribution of Si 3N 4 particles and improves the relative density of Si 3N 4p/2024Al composite. Tensile strength of Si 3N 4p/2024Al composite increases by 76.6% after T6 treatment, and after extrusion and T6 treatment it is by 57.6% more than T6 treatment only. Elastic modulus of Si 3N 4p/2024Al composite increases a little after T6 treatment but increases by 33.5% after extrusion deformation.