The incorporation of antimony (Sb) in aluminium alloys (Al) for the manufacture of pistons aims to enhance their mechanical and thermal properties, thereby optimising performance in internal combustion engines. This study analyses the microstructural characterisation and computational simulation of the metallographic and thermal behaviour in two Al alloys with 25% Sb. The microstructure of these alloys directly influences their performance. Recent research has demonstrated that rapid solidification in Al-Si alloys enhances mechanical strength and corrosion resistance by inhibiting the formation of primary silicon plates. Although these studies focus on Al-Si, they suggest that similar techniques could benefit Al-Sb alloys. Likewise, the use of severe plastic deformation methods, such as Beaten Friction Processing (FSP) and Constant Angle Channel Extrusion (ECAP), has proven to be effective in microstructural refinement, increasing the mechanical strength and ductility of aluminium alloys. Applying these techniques to Al-Sb alloys could improve their performance in pistons. Computational simulation plays a crucial role in predicting the thermal and metallographic behaviour of alloys, allowing for modelling the phase distribution and predicting mechanical properties under various operating conditions. However, the specific literature on the characterisation and simulation of Al-25% Sb alloys is limited, indicating the need for further research to fully understand the implications of the addition of Sb on the microstructure and properties of these alloys.