Aluminum-based alloy and method of fabrication of semiproducts thereof

Abstract

This invention relates to the field of metallurgy, in particular to high strength weldable alloy with low density, of aluminium-copper-lithium system. Said invention can be used in air- and spacecraft engineering. The suggested alloy comprises copper, lithium, zirconium, scandium, silicon, iron, beryllium, and at least one element from the group including magnesium, zinc, manganese, germanium, cerium, yttrium, titanium. Also there is suggested the method for fabrication of semiproducts' which method comprising heating the as-cast billet prior to rolling, hot rolling, solid solution treatment and water quenching, stretching and three-stage artificial ageing.

1 - 2 . (canceled)  
   
   
       3 . An aluminum-based alloy comprising, 3.0-3.5% copper, 1.5-1.8% lithium, 0.05-0.12% zirconium, 0.06-0.12% scandium, 0.02-0.15% silicon, 0.02-0.2% iron, 0.0001-0.02% beryllium; at least one element selected from the group consisting of 0.1-0.6% magnesium, 0.02-1.0% zinc, 0.05-0.5% manganese, 0.02-0.2% germanium, 0.05-0.2% cerium, 0.005-0.02% yttrium and 0.005-0.05% titanium; and aluminum which makes up the balance, wherein the ratio between copper/lithium (Cu/Li) is in the between about 1.9 and about 2.3.  
   
   
       4 . The aluminum-based alloy of  claim 3 , wherein the Cu/Li is 2.26.  
   
   
       5 . The aluminum-based alloy of  claim 4 , consisting of 3.4% Cu, 1.5% Li, 0.08% Zr, 0.09% Sc, 0.04% Si, 0.02% Fe, 0.07% Be, 0.3% Mg, 0.15% Mn, 0.001% Y and 94.349% Al.  
   
   
       6 . The aluminum-based alloy of  claim 3 , wherein the Cu/Li is 1.98.  
   
   
       7 . The aluminum-based alloy of  claim 6 , consisting of 3.48% Cu, 1.76% Li, 0.11% Zr, 0.069% Sc, 0.05% Si, 0.02% Fe, 0.06% Be, 0.28% Mg, 0.31% Mn, 0.02% Zn, 0.02% Ti, 0.001% Y and 93.82% Al.  
   
   
       8 . The aluminum-based alloy of  claim 3 , wherein the Cu/Li is 1.90.  
   
   
       9 . The aluminum-based alloy of  claim 8 , consisting of 3.1% Cu, 1.63% Li, 0.07% Zr, 0.1% Sc, 0.1% Si, 0.2% Fe, 0.0001% Be, 0.56% Mg, 0.3% Mn, 0.1% Ce, 0.02% Ti, and 93.8579% Al.  
   
   
       10 . A method for producing a semi-product from the alloy of  claim 3 , the method comprising 
 heating a billet of the alloy to 460-500° C.,    deforming at a temperature of not less than 400° C.,    aging at 155-165° C. for 10-12 hours, aging at 180-190° C. for 2-5 hours and aging at 155-165° C. for 8-10 hours;    cooling the billet to 90-100° C. with cooling rate of 2-5° C./hour, and    air cooling to room temperature.    
   
   
       11 . A method for fabricating a sheet of the alloy of  claim 5 , comprising heating a billet of the alloy to 490° C., rolling the billet such that the temperature of the alloy at rolling finish is 420° C., and aging the alloy at 160° C. for 10 hours, aging the alloy at 180° C. for 3 hours, and aging the alloy at 160° C. for 10 hours.  
   
   
       12 . A method for fabricating a sheet of the alloy of  claim 7 , comprising heating a billet of the alloy to 460° C., rolling the billet such that the temperature of the alloy at rolling finish is 410° C., and aging the alloy at 160° C. for 12 hours, aging the alloy at 180° C. for 4 hours, and aging the alloy at 160° C. for 10 hours.  
   
   
       13 . A method for fabricating a sheet of the alloy of  claim 9 , comprising heating a billet of the alloy to 460° C., rolling the billet such that the temperature of the alloy at rolling finish is 410° C., and aging the alloy at 160° C. for 10 hours, aging the alloy at 180° C. for 3 hours, and aging the alloy at 160° C. for 8 hours.