Abstract: Recycled A356.2 aluminum alloy holds significant application prospects in the context of low-carbon manufacturing and resource recycling. However, during multiple recycling processes, it is highly susceptible to the enrichment of Fe impurities and the subsequent formation of the acicular β-Al₅FeSi phase. This, coupled with the presence of coarse α-Al dendrites and flake-like eutectic Si phases, significantly degrades the mechanical properties of the alloy. In this study, the regulation of the microstructure and properties of recycled A356.2 aluminum alloy by TiC nanoparticles was investigated. An Al-20TiC master alloy was prepared using a combination of ball milling, cold pressing, and vacuum arc melting. Subsequently, TiC/A356.2 composites containing 0, 0.5, 1.0, and 1.5vol.%TiC were fabricated via a stir casting process. The solidification behavior, microstructure, and mechanical properties were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and cooling curve analysis. The results indicate that TiC nanoparticles remain stable within the aluminum matrix and act as effective heterogeneous nucleation sites, increasing the nucleation temperature of α-Al from 615.8℃ to 617.9℃ and reducing the secondary dendrite arm spacing (SDAS) from 20.16 μm to 15.4 μm. Simultaneously, the eutectic Si phase is significantly refined, with its size decreasing from 4.06 μm to 0.79 μm and its aspect ratio dropping from 2.68 to 1.63, while the size of the acicular β-Al₅FeSi phase is also notably reduced. The composite exhibits optimal performance at a TiC addition of 1.0vol.%, where the yield strength, ultimate tensile strength, and elongation reach 264.1 MPa, 285.6 MPa, and 11.5%, respectively. The enhancement in mechanical properties is primarily attributed to the synergistic effects of eutectic Si spheroidization, β-Al₅FeSi phase refinement.