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A magnesium alloy consisting of 1, 00 - 10, 00 % by weight of aluminium, 1, 00 - 8, 00 % by weight of rare earth metals (RE-metals), at least 40 % by weight of the RE-metals being cerium, less than 0, 5 % by weight of manganese, less than 1, 00 % by weight of zinc, 0, 00 - 3, 00 % by weight of calcium, 0, 00 - 3, 00 % by weight of strontium and the balance being magnesium and unavoidable impurities, the total impurity level being below 0, 1 % by weight.