MAGNESIUM ALLOY CONTAINING HEAVY RARE EARTHS

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Magnesium alloys which possess good processability and/or ductility whilst retaining good resistance to corrosion and/or degradation comprising one or more heavy rare earths selected from Er, Ho, Lu, Tm and Tb in a total amount of above 5.5% and no more than their respective solid solubility limit in the alloy as measured at 500°C, and Y : 0 - 10% by weight. The alloys optionally include one or more of : Nd : 0 - 5% by weight, Dy : 0 - 8% by weight, Gd : 0 – 9% by weight, Zr : 0 - 1.5% by weight, Al : 0 - 10% by weight, Zn and/or Mn : 0 - 2% by weight in total, Sc : 0 - 15% by weight, In : 0 - 15% by weight, Ca : 0 - 3% by weight, and one or more rare earths and heavy rare earths other than Y, Nd, Er, Ho, Lu, Tm, Tb, Dy and Gd in a total amount of up to 0.5% by weight, the balance being magnesium and incidental impurities up to a total of 0.3% by weight.