MAGNESIUM-ALUMINUM BASED ALLOY

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The present invention relates magnesium-aluminum based alloys having a small grain size and to a method of their production. The alloys are particularly useful in casting applications. The alloys comprise a grain refiner, the grain refiner having the chemical formula : [in-line-formulae]Mg100-x-y-zAlxCyRz [/in-line-formulae] wherein R is an element selected from the group consisting of silicon, calcium, strontium or a rare earth element, x is from 10 to 60 At. %, y is from 5 to 50 At. %, and z is from 0 to 20 At. %, provided that x+y+z is less than 100 At. %.