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In this research, the microstructural and mechanical properties of the as-cast and artificially aged Al6061-TiO2 alloy and its composites developed by the double stir casting process were studied. The reinforcements were added in different weight concentrations and artificial aging was done at 200 °C for 2 h. TiO2 particle reinforcement was adopted because of its better grain refining capacity, high elastic modulus and precipitate pinning effect. Heat treatment was performed for the formation of a high density of fine precipitates which was suitable for stress-bearing applications. The results showed an improvement in the tensile strength and hardness of the heat-treated samples up to 195.2 and 43.68%, respectively, compared to the as-cast samples. After TiO2 addition and age-hardening heat treatment, the SEM fractography showed that the small size dimples were evenly distributed which represented the enhanced ductile nature. The as-cast alloy and its composites had better damping properties compared to the age-hardened specimens. Fracture toughness and elongation showed enhancement in the heat-treated samples than in the as-cast samples. This enhancement is associated with the grain refining effect of TiO2 particles and precipitate formation. Artificially aged Al6061 alloy and its composite showed a better balance of properties.

Mechanical and damping behavior of artificially aged Al 6061/TiO2 reinforced composites for aerospace applications