Development and Characterization of Aluminium AA7075 Hybrid Composite Foams (AHCFs) Using SiC and TiB2 Reinforcement

In this study, AA7075/SiC/TiB2 closed-cell aluminium hybrid composite foams (AHCFs) with different densities were fabricated by top-loaded bottom-pouring stir casting technique. This technique uses oyster-shell powders (CaCO3 2.5 wt% of 60 μm size) as blowing agents and no viscosity-enhancing ingredient. The silicon carbide (SiC 0, 3, 6, 9, 12 25 μm) titanium diboride (TiB2 3 particle size 15 are used primary secondary reinforcement agents. It has been noted that the addition TiB2 SiC enhanced mechanical properties (modulus elasticity, yield strength, plateau strength) AHCFs. energy absorption capacity AHCFs increases up to wt%, a further increase in content leads reduction. is observed density cell wall thickness increasing pore size, porosity decrease an wt%. reinforcement. also stirring temperature strongly influenced microstructural AHCFs, 750 °C sufficient for foaming.