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A magnesium based alloy consists of, by weight : 1.4 - 1.9 % neodymium, 0.8 -1.2 % rare earth element(s) other than neodymium, 0.4 - 0.7 % zinc, 0.3 - 1 % zirconium, 0 - 0.3 % manganese, and 0 - 0.1 % oxidation inhibiting element(s) the remainder being magnesium except for incidental impurities.