MAGNESIUM ALLOYS

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A magnesium base alloy for high pressure die casting (HPDC), providing good creep and corrosion resistance, comprises : at least 91 weight percent magnesium; 0.1 to 2 weight percent of zinc; 2 to 5 weight percent of a rare earth metal component; 0 to 1 weight percent calcium; 0 to 0.1 weight percent of an oxidation inhibiting element other th an calcium (e.g. Be); 0 to 0.4 weight percent zirconium, hafnium and/or titanium; 0 to 0.5 weight percent manganese; no more than 0.001 weigh t percent strontium; no more than 0.05 weight percent silver, and no more than 0.1 weight percent aluminium, any remainder being incidenta l impurities. For making prototypes, gravity (e.g. sand) cast and HPDC components from the alloy have similar mechanical properties, in particular tensile strength. The temperature dependence of the latter, although negative, is much less so than for some other known alloys.