Investigation of Stress Corrosion Susceptibility for 7175 Aluminiun Alloy Double Peak Aged
Song Renguo; Zhang Baojin; Zeng Meiguang( Northeastern University)Jiao Huisheng(Beijing Aeronautical Material institute)
The mechanical properties and microstructures of 7175 aluminium alloy with long aging have been investigate. The results indicate that the hardness and strength of 7175 aluminium alloy have double peaks. Although the intensity of double peaks is almost equal, the stress corrosion susceptibility of the alloy 2nd peakaged is lower than that of the first peak aged. The microstructure of the alloy first peak aged is high density GP zones ,whereas the microstructure of the alloy second peak aged is GP zones and η' phase.