Aluminum alloy 7075 after solution treatment of plastic, heat strengthened particularly effective at 150 degrees below have high strength, and there is poor particularly good low temperature strength, weldability, stress corrosion cracking tendency, two-stage aging resistance can be increased scc performance. 7075 is the main alloying elements zinc, high strength, good mechanical properties and the anode reaction. Mainly used in the manufacture of high strength aircraft structures and other requirements, corrosion resistance and strong high-stress structural parts, such as aircraft, under the wing facing the wall panels, beams and so on. Good plasticity after solution treatment, heat treatment to strengthen good effect, at 150 degrees below have good strength, and there is poor particularly good low temperature strength, weldability, stress corrosion cracking.