AbstractThe mechanical properties of Al-Mg-Si alloys are depending upon many factors such as alloy composition, casting method, heat treatment procedures (solution treatment temperature, aging time and temperature) and other parameters which could affects the aging response and behaviors. In this study, aging response and fracture surface morphology of two Al-Mg-Si alloys with different wt% of Mg and Si compositions of Al-Mg-Si alloys were investigated. The experimental procedures were started with a heat treatment process where firstly both alloy samples were solution treated at 540 �C for 30 minutes, followed by quenched into cold water. The solution treated alloy samples were artificially aged at an elevated temperature of 170 oC for 0.1 to 100 hours. The aging response and mechanical properties were examined by Vickers hardness and tensile test. The surface fractured morphology from the tensile specimen in peak-aged condition at 170 �C was carried out using a field emission scanning el.....