Aluminum alloy and the utilization thereof for a cast component, in particular a motor vehicle

Abstract

The invention relates to an aluminum alloy, in particular a pressure casting alloy, preferably for a cast component of a motor vehicle, with the following alloy elements: 6.5 to <9.5% by weight of silicon, 0.3 to 0.6% by weight of manganese, 0.15 to 0.35% by weight of iron, 0.02 to 0.6% by weight of magnesium, a maximum of 0.1% by weight of titanium, 90 to 180 ppm strontium and aluminum as the remainder, with a maximum of 0.05% by weight, and a total maximum of 0.2% by weight of production-related contaminants. The alloy is particularly suitable for the pressure casting of the cast components of a motor vehicle such as oil pans, for example.

1 . Aluminium alloy, in particular a pressure casting alloy, preferably for a cast component of a motor vehicle, comprising the following alloying elements: 
     
       
         
               
               
               
             
                   
                   
               
                   
                 6.5 to <9.5 
                 % by weight silicon 
               
                   
                 0.3 to 0.6 
                 % by weight manganese 
               
                   
                 0.15 to 0.35 
                 % by weight iron 
               
                   
                 0.02 to 0.6 
                 % by weight magnesium 
               
                   
                 max. 0.1 
                 % by weight titanium 
               
                   
                 90 to 180 
                 ppm strontium 
               
                   
                   
               
           
              
             
             
              
              
              
              
              
              
              
             
          
         
       
     
     and aluminium as the remainder, with a maximum of 0.05% by weight individually, and a maximum of 0.2% by weight in total, of production-related contaminants. 
   
   
       2 . Aluminium alloy according to  claim 1 , wherein said alloy, as cast, exhibits a hardness of >80 HB, preferably between 84 HB and 88 HB. 
   
   
       3 . Aluminium alloy according to  claim 1 , wherein said alloy, as cast, exhibits an elongation at break A 5  of >5%, preferably of 8% to 12%. 
   
   
       4 . Aluminium alloy according to  claim 1 , wherein said alloy contains 0.1 to 0.4% by weight of copper as a further alloying element. 
   
   
       5 . Aluminium alloy according to  claim 1 , wherein said alloy contains 0.22 to 0.4% by weight, preferably 0.32 to 0.36% by weight, of magnesium. 
   
   
       6 . Use of an aluminium alloy comprising the following alloying elements:
 6.5 to <9.5% by weight silicon   0.3 to 0.6% by weight manganese   0.15 to 0.35% by weight iron   0.02 to 0.6% by weight magnesium   max. 0.1% by weight titanium   90 to 180 ppm strontium   and aluminium as the remainder, with a maximum of 0.05% by weight individually, and a maximum of 0.2% by weight in total, of production-related contaminants in a cast component, in particular an oil pan of a motor vehicle.   
   
   
       7 . Use of an aluminium alloy according to  claim 6 , wherein the cast component is produced in a pressure casting process. 
   
   
       8 . Use of an aluminium alloy according to  claim 6  wherein the cast component is subjected to a heat treatment process after the casting process. 
   
   
       9 . Use of an aluminium alloy according to  claim 8 , wherein the cast component is partially solution treated in a temperature range of from 400 to 490° C., in particular in a temperature range of from 420 to 460° C., for a duration of from 20 to 120 minutes, and is subsequently air-cooled. 
   
   
       10 . Cast component, which is produced from an aluminium alloy comprising the following alloying elements:
 6.5 to <9.5% by weight silicon   0.3 to 0.6% by weight manganese   0.15 to 0.35% by weight iron   0.02 to 0.6% by weight magnesium   max. 0.1% by weight titanium   90 to 180 ppm strontium   and aluminium as the remainder, with a maximum of 0.05% by weight individually, and a maximum of 0.2% by weight in total, of production-related contaminants.   
   
   
       11 . Cast component according to  claim 10 , wherein said component is formed as an oil pan for a motor vehicle. 
   
   
       12 . Cast component according to  claim 10 , wherein all regions of said component as cast exhibit an at least approximately uniform hardness of >80 HB, preferably between 84 HB and 88 HB. 
   
   
       13 . Cast component according  claim 10 , wherein all regions of said component as cast exhibit an at least approximately uniform elongation at break A 5  of >5%, preferably of 8% to 12%. 
   
   
       14 . Cast component according to  claim 13 , wherein said cast component is at least partially solution treated in a temperature range of from 400 to 490° C., in particular in a temperature range of from 420 to 460° C., for a duration of from 20 to 120 minutes and subsequently air-cooled.