Aluminum-based alloy and method of fabrication of semiproducts thereof

A method for fabricating a sheet of 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;

• and 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 between about 1.9 and about 2.3,
• comprising
• heating a billet of the alloy to 460-500° C.,
• deforming at a temperature of ≧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.