Aluminum alloy for die casting, production method of die casting product using same alloy, and die casting product by same method

Abstract

An aluminum alloy for a die casting, used as the material of parts of an automotive vehicle. The aluminum alloy consists essentially of Si in an amount ranging from 10 to 12% by weight, Mg in an amount ranging from 0.15 to 0.50% by weight, Mn in an amount ranging from 0.5 to 1.0% by weight, Fe in an amount of not more than 0.15% by weight, Ti in an amount of not more than 0.1% by weight, Sb in an amount ranging from 0.05 to 0.20% by weight, B in an amount ranging from 0.005 to 0.02%, and balance consisting of aluminum and inevitable impurities.

What is claimed is:  
     
         1 . An aluminum alloy for a die casting, comprising Si in an amount ranging from  10  to 12% by weight, Mg in an amount ranging from 0.15 to 0.50% by weight, Mn in an amount ranging from 0.5 to 1.0% by weight, Fe in an amount of not more than 0.15% by weight, Ti in an amount of not more than 0.1% by weight, Sb in an amount ranging from 0.05 to 0.20% by weight, B in an amount ranging from 0.005 to 0.02%, and balance consisting of aluminum and inevitable impurities.  
     
     
         2 . An aluminum alloy as claimed in  claim 1 , wherein Sb in the amount ranging from 0.05 to 0.20% by weight is replaced with Sr in an amount ranging from 0.005 to 0.020% by weight.  
     
     
         3 . A method of producing a die casting product, comprising: 
 forming an aluminum alloy of  claim 1  into a die casting by high vacuum die casting to obtain the die casting product.    
     
     
         4 . A method as claimed in  claim 3 , further comprising: 
 accomplishing a solution treatment on the die cast product; and    accomplishing an aging treatment on the die cast product after the solution treatment.    
     
     
         5 . A method as claimed in  claim 4 , wherein the solution treatment is accomplished at a temperature of not lower than 530° C. for a time of not longer than 1 hr.  
     
     
         6 . A die casting product produced by the method of  claim 3 .  
     
     
         7 . A die casting product as claimed in  claim 6 , wherein the die casting product is one selected from the group consisting of a A pillar, a B pillar, a C pillar, a roof, a joint of a space frame, and an installation section of a suspension of an automotive vehicle.  
     
     
         8 . A die casting product as claimed in  claim 6 , wherein the die casting product is one selected from the group consisting of a suspension arm, a sub-frame, a link part of a suspension, and an engine cradle of an automotive vehicle.