To provide an aluminum alloy which is suitable for die-casting a component having a high elongation percentage as-cast.

The cast alloy comprises, by weight, 8.5 to 10.5% silicon, 0.5 to 0.9% manganese, ≤0.06% magnesium, ≤0.15% iron, ≤0.03% copper, ≤0.10% zinc, ≤0.15% titanium and 0.05 to 0.5% molybdenum, and 30 to 300 ppm strontium or 5 to 30 ppm sodium and/or 1 to 30 ppm calcium for improving durability in addition to aluminum and inevitable impurities. The cast alloy can comprise 0.05 to 0.3% zirconium, gallium phosphide and/or indium phosphide in an amount equal to 1 to 250 ppm of phosphorus, and/or titanium and boron added by an aluminum master alloy comprising 1 to 2% Ti and 1 to 2% B for refining crystal grains.