Patent ID: 8771441
Filing Date: 2014-07-08
Classification: C22C,C22F

Abstract:
1. An aluminum alloy rolled product not exceeding 0.5 inch in thickness comprising 2.3 to 2.5 wt. % Cu, 0.2 to 0.6 wt. % Li, 0.1 to 0.4 wt. % Ag, 0.2 to 0.4 wt. % Mg, 0.2 to 0.4 wt. % Mn, a content of Fe and Si less or equal to 0.05 wt. % each, and a content of unavoidable impurities less than or equal to 0.05 wt. % each and 0.15 wt. % total, and the alloy being substantially zirconium free, wherein said zirconium is present an amount of not more than about 0.04 wt. %, wherein said product comprises a difference between the tensile yield strength at 45° to the rolling direction and the tensile yield strength in the LT direction as defined by (TYS (TL)−TYS))(45° /TYS (TL) from +5% to -5%, an ultimate tensile strength in the L-direction of at least 420 MPa, and the fracture toughness using CCT760 (2a0=253 mm), including a crack extension of the last valid point of the R-curve Δaeff(max), in the T-L direction, of at least 60 mm and K