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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.