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The aim of this investigation is to establish a structure-property correlation of Mg-8%Sn alloys aged at different time interval. The alloy under the present investigation was aged at elevated (200 °C) temperature for various holding period. Differently aged alloys show retention of intermetallic phases after ageing, but in different area fraction of the same with ageing time. Mechanical properties evaluation and corresponding microstructural characterizations were performed to correlate their strength and ductility properties with their microstructural features (i.e., grain size, grain connectivity and the area fraction of intermetallic phases). Keywords: Magnesium alloys, Grain boundary triple points, Strength, Ductility, Intermetallic phase