Electron-microscopic investigations of irradiated and naturally aged aluminium alloy

The decay kinetics of solid solution, irradiated and naturally aged alloy of Al-Cu-Mg-Mn system was investigated by the method of transmission electron microscopy. It was shown that in irradiated and natural aged alloy the decay of solid solution proceeds in other mechanism than in non-irradiated one. As a result of irradiation the multilayer dislocation loops of interstitial nature, which serves as discharges for impurity atoms and the centre of metastable phase S' and Θ'. It was shown that it promotes to form the more homogeneous and uniform structure of alloy that in one's turn improve the mechanical alloy properties. 11 refs.; 2 figs