Combination of casting process and alloy composition

Abstract

A process for casting a magnesium alloy consisting of 10.00-13.00% by weight of aluminium, 0.00-10.00% by weight of zinc, and 5.00-13.00% by weight of aluminium, 10.00-22.00% by weight of zinc, also containing 0.10-0.5% by weight of manganese, and the balance being magnesium and unavoidable impurities, the total impurity level being below 0.0% by weight, wherein the alloy is cast in a die in which the temperature is controlled in the range of 150-340° C., the die is filled in a time which expressed in milliseconds is equal to the product of a number between 2 and 300 multiplied by the average part thickness expressed in millimetre, the static metal pressures being maintained during casting between 20-70 MPa and may subsequently be intensified up to 180 MPa.

1 . A process for casting a magnesium alloy consisting of
 10.00-13.00% by weight of aluminium,   0.00-10.00% by weight of zinc, and   5.00-13.00% by weight of aluminium,   10.00-22.00% by weight of zinc,   also containing   0.10-0.5% by weight of manganese,   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 in which the temperature is controlled in the range of 150-340° C., 
 the die is filled in a time which expressed in milliseconds, is equal to the product of a number between 2 and 300 multiplied by the average part thickness expressed in millimeter, 
 the static metal pressures being maintained during casting is between 20-70 MPa and may subsequently be intensified up to 180 MPa. 
   
     
     
         2 . A process according to  claim 1 ,
 characterized in that the die temperature is controlled to a temperature in the range between 160 and 300° C., preferably in the range between 200 and 270° C.   
     
     
         3 . A process according to  claim 1 ,
 characterized in that the filling time of the die expressed in milliseconds is equal to the product of the average part thickness expressed in millimetre multiplied by a number between 2 and 200, preferably between 3 and 50, most preferably between 3 and 20.   
     
     
         4 . A process according to  claim 3 ,
 characterized in that the static metal pressure during casting is maintained between 30-70 MPa.   
     
     
         5 . A process according to  claim 4 ,
 characterized in that the cooling rate after casting is in the range of 10-1000° C./s.   
     
     
         6 . A process according to  claim 5 ,
 characterized in that the aluminium content is between 10.00 and 13.00% by weight, preferably between 10.00 and 12.00% by weight.   
     
     
         7 . A process according to  claim 6 ,
 characterized in that the Zn content is between 0.00 and 10.00% by weight.   
     
     
         8 . A process according to  claim 7 ,
 characterized in that the aluminium content is between 10.00 and 12.00% by weight and the Zn-content is between 0.00 and 4.00% by weight.   
     
     
         9 . The process according to  claim 5 ,
 characterized in that the aluminium content is between 5.00 and 13.00% by weight, preferably between 6.00 and 12.00% by weight.   
     
     
         10 . The process according to  claim 9 ,
 characterized in that the Zn content is between 10.00 and 22.00% by weight.   
     
     
         11 . The process according to  claim 10 ,
 characterized in that the aluminium content is between 6.00 and 12.00% by weight and the Zn-content is between 10.00 and 18.00% by weight.