Thixoforming is considered a feasible technology to form alloys in a semisolid state into almost near net-shaped products. This study aims at examining the microstructural and mechanical properties behaviours related to thixoformed-T6 Al-5.7Si-2Cu-0.3Mg alloys and make a comparison with the conventional mould cast alloy. Cooling slope alloys’ chemical composition was revealed through X-ray fluorescence. Solution heat treatment was carried out at 485°C at solution times of 12 hours. Optical microscopy, energy dispersive X-ray spectroscopy, scanning electron microscopy and X-ray diffraction were employed to analyse the phase formation and microstructure of the alloys. The tensile test was done to define the mechanical properties of alloy. According to the microstructural improvement and the decreasing in porosity of alloy and showing spheroidal ɑ-Al grains with evenly distributed Si particles due to the applying T6 heat treatment during the thixoforming process. In addition, the mechanical properties of thixoformed-T6 Al-5.7Si-2Cu-0.3Mg alloys were remarkability improved, so this alloy can be used sucssefully to produce different components in automotive.