Laser Powder Bed Fusion (LPBF) additive manufacturing enables the production of high-strength aluminum alloys with complex geometries. However, effective thermal post-treatments are essential to optimize their mechanical performance for industrial applications. This thesis investigates a modified AlSi10Mg alloy with 8% Cu (AlSi10Mg+8Cu) processed via LPBF, with the objective of tailoring its thermal and mechanical properties through an advanced heat treatment approach. Specifically, the study aims to develop an energy-efficient aging procedure that enhances ductility without significantly compromising hardness, thereby expanding the alloy’s suitability for lightweight structural applications. To this end, a low-temperature artificial aging strategy (T5 treatment) was developed and experimentally assessed.