Microstructure, thermal behavior and mechanical properties of squeeze cast SiC, ZrO2 or C reinforced ZA27 composites

▶ ZA27 with 5% SiC, ZrO2 or C particles are synthesized by stirring then squeezed. ▶ Particles refine the structure. 50 MPa decreases porosity% and increases density. ▶ α and β nucleation temperatures of the composites are lower than those of the matrix. ▶ Particles accelerate age hardening and increase peak hardness of the composites ▶ Particles reduce the CTEs of composites compared to those of the matrix.