A COMBINATION OF CASTING PROCESS AND ALLOY COMPOSITIONS RESULTING IN CAST PARTS WITH SUPERIOR COMBIN

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A process for casting a magnesium alloy consisting of 2, 0-6, 00 %% by weight of aluminium, 3, 00-8, 00 %% by weight of rare earth metals (RE-metals), the ratio of the amount of RE-metals to the amount of aluminium expressed as %% by weight being larger than 0, 8, at least 40 %% by weight of the RE-metals being cerium, less than 0, 5 %% by weight of manganese, less than 1, 00 %% by weight of zinc, less than 0, 01 %% by weight of calcium less than 0, 01 %% by weight of strontium and the balance being magnesium and unavoidable impurities, the total impurity level being below 0, 1 %% by weight, wherein the alloy is cast in a die the temperature of which is controlled in the range of 180-340°C, the die is filled in a time which expressed in milliseconds is equal to the product of a number between 5 and 500 multiplied by the average part thickness expressed in millimeter, the static metal pressures being maintained during casting between 20-70 MPa and is subsequently intensified up to 180 MPa. © KIPO & WIPO 2008