Aluminum-copper-lithium alloy product for a lower wing skin element with improved properties

A rolled and/or forged product having a thickness of between 20 and 100 mm, wherein at mid-thickness the volume fraction of grains having a brass texture is between 25 and 40% and the texture index is between 12 and 18,

• wherein the rolled and/or forged product is produced by a process comprising
• (a) casting a slab of alloy comprising, as a percentage by weight,
• Cu:
• 1.9-2.3
• Li:
• 1.3-1.8
• Mg:
• 0.1-0.5
• Mn:
• <0.05
• Zr:
• 0.10-0.16
• Ag:
• 0-0.5
• Zn:
• <0.20
• Ti:
• 0.01-0.15
• Fe:
• <0.1
• Si:
• ≤0.1
• other elements<0.05 each and <0.15 total, the remainder aluminum with a density less than 2.670 g/cm3,
• (b) homogenizing said slab at 480 to 540° C. for 5 to 60 hours,
• (c) hot working said slab by rolling and/or forging, the hot working conditions being such that a final hot working temperature is at the most 400° C. to obtain a rolled and/or forged product having a thickness of between 20 and 100 mm,
• (d) solution-heat treating said product at 490 to 530° C. for 15 minutes to 8 hours,
• (e) quenching said product with water,
• (f) controlled stretching said product with a permanent deformation of 1 to 6%,
• (g) right after controlled stretching said product, artificially aging said product by heat treatment at 120 to 170° C. for 20 to 60 hours.