Magnesium based alloy

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A magnesium based alloy consisting of, by weight : 2-5% rare earth elements, wherein the alloy contains lanthanum and cerium as rare earth elements and the lanthanum content is greater than the cerium content; 0.2-0.8% zinc; 0-0.15% aluminium; 0-0.5% yttrium or gadolinium; 0-0.2% zirconium, 0-0.3% manganese; 0-0.1% calcium; 0-25 ppm beryllium; and the remainder being magnesium except for incidental impurities.