Abstract:With the urgent demand for high-performance thermal management components in aerospace field, multifunctional components that combine efficient heat dissipation with excellent mechanical load-bearing capacity have become a focus of research. Using finite element simulation and experimental characterization methods, this study systematically investigated the influence of volume fraction on the forming quality, mechanical response, and heat exchange performance of AlMgScZr alloy Primitive lattice structures formed by selective laser melting (SLM) technique. The results indicate that although the SLM-formed Primitive structure exhibits surface roughness and dimensional deviations, its overall forming quality meets functional requirements. In terms of mechanical properties, an increase in volume fraction significantly enhances the mechanical performance of the lattice structure. When the volume fraction reaches 25%, the compressive modulus reaches 1664.06 MPa, the peak plateau stress is 42.85 MPa, and the energy absorption per unit volume increases significantly with increasing volume fraction. In terms of heat exchange performance, the Nusselt number (Nu) of the Primitive lattice structure with a volume fraction of 25% increases by 41.6% compared to that with a volume fraction of 10%. The increase in Reynolds number (Re) further enhances convective heat transfer efficiency, but this is accompanied by an increase in friction factor (f). This study achieved synergistic regulation of heat exchange and mechanical properties through volume fraction optimization, providing a reference for the application of Primitive lattice structures in thermal management components.