A combination of casting process and alloy compositions...

B - Operations – Transporting – 22 – D

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B22D 21/00 (2006.01) B22D 17/08 (2006.01) C22C 23/02 (2006.01) C22C 23/06 (2006.01)

Patent

CA 2627491

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.

Procédé de coulage d~alliage de magnésium consistant en 2,0 à 6,00 % en poids d~aluminium, 3,00 à 8,00 % en poids de métaux de terre rare (métaux RE), le rapport de la quantité de métaux RE à la quantité d~aluminium exprimé en % en poids étant supérieur à 0,8, au moins 40 % en poids des métaux RE étant du cérium, moins de 0,5 % en poids de manganèse, moins de 1,00 % en poids de zinc, moins de 0,01 % en poids de calcium, moins de 0,01 % en poids de strontium, et le reste étant composé de magnésium et des impuretés inévitables, le niveau d~impureté total étant inférieur à 0,1 % en poids, l~alliage étant coulé dans une filière dont la température est contrôlée dans la fourchette de 180 à 340°C, la filière étant remplie dans un temps qui exprimé en millisecondes est égal au produit d~un nombre entre 5 et 500 multiplié par l~épaisseur de pièce moyenne exprimée en millimètres, les pressions de métal statiques étant maintenues pendant le coulage entre 20 et 70 MPa et intensifiées ensuite jusqu~à 180 MPa.

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