Part cast made from aluminum alloy with high hot strength

Abstract

Cast part with high creep resistance, made of an alloy with a composition comprising (% by weight): Si: 5-11 Fe<0.6 Mg: 0.15-0.6 Cu: 0.3-1.5 Ti: 0.05-0.25 Zr: 0.05-0.25 Mn<0.4 Zn<0.3 Ni<0.4 other elements<0.10 each and 0.30 total, remainder aluminium.

1 . Cast part with high creep resistance, made of an alloy with a composition comprising (% by weight): 
 Si: 5-11    Fe<0.6    Mg: 0.15-0.6    Cu: 0.3-1.5    Ti: 0.05-0.25    Zr: 0.05-0.25    Mn<0.4    Zn<0.3    Ni<0.4    other elements<0.10 each and 0.30 total, remainder aluminium.    
   
   
       2 . Part according to  claim 1 , wherein silicon is from 6.5 to 7.5%.  
   
   
       3 . Part according to  claim 1 , wherein iron is at most 0.3%.  
   
   
       4 . Part according to  claim 1 , wherein copper is from 0.4 to 0.7%.  
   
   
       5 . Part according to  claim 1 , wherein magnesium is from 0.25 to 0.5%.  
   
   
       6 . Part according to  claim 1 , wherein magnesium and copper are present such that 0.3Cu+0.18<Mg<0.6.  
   
   
       7 . Part according to  claim 1 , wherein titanium is from 0.08 to 0.20%.  
   
   
       8 . Part according to  claim 1 , wherein zirconium is from 0.12 to 0.18%.  
   
   
       9 . Part according to  claim 1 , wherein manganese is from 0.1 to 0.3%.  
   
   
       10 . Part according to  claim 1 , wherein zinc is at most 0.1%.  
   
   
       11 . Part according to  claim 1 , wherein nickel is at most 0.1%.  
   
   
       12 . Part according to  claim 1 , wherein said part is solution heat treated, quenched and tempered to T6 or T7.  
   
   
       13 . Part according to  claim 1 , wherein said part is a cylinder head or a crankcase of an automobile or aircraft engine.  
   
   
       14 . Part according to  claim 2 , wherein iron is at most 0.3%.  
   
   
       15 . Part according to  claim 2 , wherein copper is from 0.4 to 0.7%.  
   
   
       16 . Part according to  claim 3 , wherein copper is from 0.4 to 0.7%.  
   
   
       17 . Part according to  claim 2 , wherein magnesium is from 0.25 to 0.5%.  
   
   
       18 . Part according to  claim 3 , wherein magnesium is from 0.25 to 0.5%.  
   
   
       19 . Part according to  claim 4 , wherein magnesium is from 0.25 to 0.5%.  
   
   
       20 . Part according to  claim 2 , wherein magnesium and copper are present such that 0.3Cu+0.18<Mg<0.6.