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The aluminum-free magnesium alloy has a composition of at least 87.5 wt.% magnesium, produced by adding 0.5 to 2.0 wt.% cerium, 0.2 to 2.0 wt.% lanthanum, 0 to 5 wt.% of at least one further metal from the group of the rare earths, 1.5 to 3.0 wt.% of a manganese compound, and 0 to 0.5 wt.% of a phosphorus compound.