Aluminum alloy products and artificial aging method

铝合金产品如板材、锻件和挤压件，其适合于航空结构部件，例如整体的机翼翼梁、翼肋和腹板。所述合金产品含有约：6-10wt.％Zn；1.2-1.9wt.％Mg；1.2-2.2wt.％Cu，其中，Mg≤(Cu+0.3)；以及约0.05-0.4wt.％Zr，余者为Al，附带的元素和杂质。优选地，所述合金含有约6.9-8.5wt.％Zn；1.2-1.7wt.％Mg；1.3-2wt.％Cu。厚尺寸的该合金提供改善的强度与断裂韧性组合。当采用优选实施方案中的三阶段方法进行人工时效时，该合金也能获得包括在海边条件下较优的SCC性能。 Aluminum alloy products, such as plate, forgings and extrusions, suitable for use in making aerospace structural components like integral wing spars, ribs and webs, comprises about: 6 to 10 wt. % Zn; 1.2 to 1.9 wt. % Mg; 1.2 to 2.2 wt. % Cu, with Mg (Cu + 0.3); and 0.05 to 0.4 wt. % Zr, the balance Al, incidental elements and impurities. Preferably, the alloy contains about 6.9 to 8.5 wt. % Zn; 1.2 to 1.7 wt. % Mg; 1.3 to 2 wt. % Cu. This alloy provides improved combinations of strength and fracture toughness in thick gauges. When artificially aged per the three stage method of preferred embodiments, this alloy also achieves superior SCC performance, including under seacoast conditions.