➀ The research investigates the effects of adding TiC nanoparticles to aluminum alloy 7075, aiming to enhance casting performance and improve fluidity and surface quality; ➁ TiC nanoparticles were introduced in two concentrations, and their impact on fluidity and microstructure was analyzed; ➂ The results showed a significant improvement in fluidity and surface quality, with finer grain sizes and smoother surfaces.