Aluminum-copper-lithium alloy with improved mechanical strength and toughness

An aluminum-based wrought product that is rolled and has a thickness from 10-130 mm, said product comprising, in weight %:

• Cu:
• 3.5-3.7;
• Li:
• 0.9-1.2;
• Mg:
• 0.6-0.8;
• Zr:
• 0.05-0.18;
• Ag:
• 0.0-0.5;
• Mn:
• 0.0-0.5;
• Fe+Si≤0.20;
• Zn≤0.15;
• at least one element selected from the group consisting of:
• Ti:
• 0.01-0.15;
• Sc:
• 0.05-0.3;
• Cr:
• 0.05-0.3;
• Hf:
• 0.05-0.5;
• other elements ≤0.05 each and ≤0.15 total, remainder aluminum;
• wherein the composition is selected so as to obtain a density that is not more than 2.71 g/cm3,
• which in a rolled state, solution treated, quenched and aged so as to obtain a near-peak yield strength, has, at half-thickness, at least one of the following pairs of properties:
• for thicknesses from 10 to <30 mm:
• a yield strength Rp0.2(L)≥525 MPa and a toughness K1C (L−T)≥45 MPa√m,
• for thicknesses of 30 to <60 mm:
• a yield strength Rp0.2(L)≥525 MPa and a toughness K1C (L−T)≥43 MPa√m,
• for thicknesses of 60 to <100 mm:
• a yield strength Rp0.2(L)≥520 MPa and a toughness K1C (L−T)≥40 MPa√m, or
• for thicknesses of 100 to 130 mm, at half-thickness, a yield strength Rp0.2(L)≥510 MPa and a toughness K1C (L−T)≥37 MPa√m,
• and wherein at least two properties of the product do not change more than 5% after thermal exposure of 1000 hours at 85° C., the at least two properties selected from the group consisting of:
• tensile yield strength Rp0.2 (L), ultimate tensile stress UTS (Rm L), and an elongation at rupture A % (L).