Patent ID: 8083870
Filing Date: 2011-12-27
Classification: B22D,C22C,C22F

Abstract:
1. A wrought aluminum alloy product having a sectional thickness of at least about 4 inches, the wrought aluminum alloy product comprising 7.0-9.5 wt. % Zn, 1.4-1.9 wt. % Mg, 1.4-1.9 wt. % Cu, up to 0.3 wt. % Zr, up to 0.4 wt. % Sc, up to 0.3 wt. % Hf, less than 0.05 wt. % Cr, and up to about 90.2% aluminum, wherein the combined amount of Cu and Mg does not exceed 3.5 wt. %, and wherein the aluminum alloy product realizes a longitudinal tensile yield strength and fracture toughness combination that satisfies the expression FT≧91.5-0.8333 (TYS) at a minimum longitudinal tensile yield strength of at least about 63 ksi, wherein FT is the quarter-plane L-T fracture toughness as measured in accordance with ASTM Standard E399, and wherein TYS is the quarter-plane longitudinal tensile yield strength measured in accordance with ASTM Standard E8.