Copper aluminum alloy molded part having high mechanical strength and hot creep resistance

Abstract

The subject of the invention is a cast part with high static mechanical strength, and high hot creep strength, made of aluminum alloy of chemical composition: Si: 0.02-0.50%, Fe: 0.02-0.30%, Cu: 3.5-4.9%, Mn: <0.70%, Mg: 0.05-0.20%, Zn <0.30%, Ni: <0.30%, V: 0.05-0.30%, Zr: 0.05-0.25%, Ti: 0.01-0.35%, other elements in total <0.15%; and 0.05% each, the remainder being aluminum. It more particularly relates to cylinder heads for supercharged diesel or gasoline internal combustion engines.

1 . Cast part with high static mechanical strength at ambient and hot temperatures and high creep strength at high temperature, cast in aluminum alloy with a chemical composition comprising, expressed as percentages by weight:
 Si: 0.02-0.50%   Fe: 0.02-0.30%   Cu: 3.5-4.9%   Mn: <0.70%   Mg: 0.05-0.20%   Zn: <0.30%   Ni: <0.30%   V: 0.05-0.30%   Zr: 0.05-0.25%   Ti: 0.01-0.35%   other elements in total <0.15%; and less than 0.05% each,   the remainder being aluminum.   
     
     
         2 . Cast part according to  claim 1 , characterized in that the magnesium content of the alloy is between 0.07 and 0.20%. 
     
     
         3 . Cast part according to  claim 1 , characterized in that the magnesium content lies between 0.08 and 0.20%. 
     
     
         4 . Cast part according to  claim 1 , characterized in that the copper content lies between 3.8 and 4.9%. 
     
     
         5 . Cast part according to  claim 1 , characterized in that the vanadium content is between 0.08-0.25%. 
     
     
         6 . Cast part according to  claim 1 , characterized in that the zirconium content lies between 0.08 and 0.20%. 
     
     
         7 . Cast part according to  claim 1 , characterized in that the titanium content lies between 0.05 and 0.25%. 
     
     
         8 . Cast part according to  claim 1 , characterized in that the silicon content lies between 0.02 and 0.20%. 
     
     
         9 . Cast part according to  claim 1 , characterized in that the iron content lies between 0.02 and 0.20%. 
     
     
         10 . Cast part according to  claim 1 , characterized in that the manganese content lies between 0.20 and 0.50%. 
     
     
         11 . Cast part according to  claim 1 , characterized in that the zinc content is less than 0.10%. 
     
     
         12 . Cast part according to  claim 1 , characterized in that the nickel content is less than 0.10%. 
     
     
         13 . Cast part according to  claim 1 , having undergone T7 or T6 type heat treatment. 
     
     
         14 . Insert comprising a cast part according to  claim 1 . 
     
     
         15 . Insert according to  claim 14 , characterized in that said insert is essentially made up of the cast part. 
     
     
         16 . Cast part according to  claim 1 , wherein the cast part is a cylinder head. 
     
     
         17 . Method for casting cylinder head according to  claim 16 , comprising:
 providing a mold formed from an aggregate and a water-soluble binder;   casting the alloy in the mold;   spraying water on the mold so as to break up the mold and cool the cylinder head.   
     
     
         18 . Cast part according to  claim 1 , characterized in that the magnesium content lies between 0.09 and 0.13%. 
     
     
         19 . Cast part according to  claim 1 , characterized in that the copper content lies between 4.0 and 4.8%. 
     
     
         20 . Cast part according to  claim 1 , characterized in that the vanadium content is between 0.10-0.20%. 
     
     
         21 . Cast part according to  claim 1 , characterized in that the titanium content lies between 0.10 and 0.20%. 
     
     
         22 . Cast part according to  claim 1 , characterized in that the silicon content lies between 0.02 and 0.06%. 
     
     
         23 . Cast part according to  claim 1 , characterized in that the iron content lies between 0.02 and 0.12%. 
     
     
         24 . Cast part according to  claim 1 , characterized in that the iron content lies between 0.02 and 0.06%. 
     
     
         25 . Cast part according to  claim 1 , characterized in that the zinc content is less than 0.03%. 
     
     
         26 . Cast part according to  claim 1 , characterized in that the nickel content is less than 0.03%.