High-ductility aluminium alloy part cast under pressure

Abstract

A safety or structural part cast under pressure made of high-ductility aluminum alloy containing, by weight: Si 2-6%; Mg<0.40%; Cu<0.30%; Zn<0.30%; Fe<0.50%; Ti<0.30%, at least one element for reducing adherence to the mold such as Mn (0.3-2%), Cr (0.1-0.3%), Co (0.1-0.3%), V (0.1-0.3%) or Mo (0.1-0.4%), and at least one element for modifying eutectics, such as Sr (50-500 ppm), Na (20-100 ppm) or Ca (30-120 ppm). Other elements may be present in an amount <0.05 each and <0.10 in total, the balance being aluminum. The part exhibits, after T5 tempering at a temperature less than 220° C., a yield strength R p 0.2>110 MPa and an elongation A>10%.

1 . Die-cast safety or structural part made of ductile aluminum alloy consisting essentially of, by weight: 
 Si: 2-6%; Mg<0.40%; Cu<0.30%; Zn<0.30%; Fe<0.50%; Ti<0.30%;    at least one element for reducing adherence to a mold selected from the group consisting of Mn 0.3, 2%, Cr 0.1, 0.3%, Co 0.1-0.3%, V 0.1-0.3% and Mo 0.1-0.4%, and    at least one eutectic modifying element, selected from the group consisting of Sr 50-500 ppm, Na 20-100 ppm and Ca 30-120 ppm,    other elements <0.05% each and <0.10% in total, the remainder being aluminium aluminum,    said part having after artificial ageing T5 at a temperature below 220° C., a yield strength R p 0.2>100 MPa and an elongation A>10%.    
     
     
         2 . Part according to  claim 1 , characterised in that the silicon content is between 3.5 and 5%.  
     
     
         3 . Part according to  claim 1 , characterised in that the magnesium content is between 0.05 and 0.25%.  
     
     
         4 . Part according to  claim 1 , characterised in that the titanium content is between 0.05 and 0.15%.  
     
     
         5 . Part according to  claim 1 , characterised in that the copper content is less than 0.10%.  
     
     
         6 . Part according to  claim 1 , characterised in that the iron content is less than 0.20%.  
     
     
         7 . Part according to  claim 1 , characterised in that the zinc content is less than 0.10%.  
     
     
         8 . Part according to  claim 1 , characterised in that the manganese content is between 0.7 and 1.5%.