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The alloy contains, in % by weight : a) either 15-20 Al and 8-10 Cu, or 25-30 Al and 15-20 Cu; and b) 0.01-2 Si, 0-0.1 Mg, 0-0.5 Ti, 0-0.5 Cr, 0-1 Mn, 0-0.5 Nb and 0-0.1 of a rare-earth metal or metal mixture, the remainder being zinc. This alloy has a good creep resistance and an excellent tensile strength when it contains 15-20 Al and 8-10 Cu and an excellent creep resistance and a good tensile strength when it contains 25-30 Al and 15-20 Cu.