| abstract |
A high strength and high fracture toughness 7xxx series aluminum alloy product comprising 6.5 to 7.2 wt % Zn, 1.55 to 1.95 wt % Cu, 1.75 to 2.15 wt % Mg, 0.095 to 0.15 wt % Zr, impurities Element and the rest are Al. In one embodiment, the aluminum alloy product includes a Mg/Cu ratio in the range of 1.05 to 1.35 and a Zn/Mg ratio in the range of 3.2 to 4.0. This aluminum alloy product can be used to make sheet, extruded or forged products, especially for aerospace structural components. This product has an excellent combination of strength, fracture toughness, Kmax at the deflection point of fatigue cracks, ductility in different directions and corrosion resistance suitable for aerospace applications. |