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Effects of severe plastic deformation by isothermal сryorolling at a temperature of liquid nitrogen with a strain of e ~ 2 and subsequent aging on structure, hardness and resistance to intergranular corrosion (IGC) of the preliminary quenched ingots of the conventional and Zr modified composition of D16 aluminum alloy, were investigated. It was found that both the alloys in the natural aged condition demonstrate slight effect on IGC resistance. It was caused by low difference in electrochemical potentials between the matrix and Guinier-Preston-Bagaratsky zones. Artificial aging at 190°C for 12 hrs to the maximum strength (T1 route) led to strong decrease in IGC resistance of both rolled and non-rolled states of the alloys due to precipitation of strengthening phases. Modification the D16 alloy composition via substitution of Mn by twice less amounts of Zr and decrease in impurity contents had a minor influence on its structure and hardness in the initial and rolled conditions. However, it significantly enhanced corrosion resistance, reducing its depth and intensity, in both naturally and artificially aged conditions. It was concluded that the main factors, determining the alloy microstructure changes, mechanical and corrosion behavior, are the volume fraction, morphology, and spatial distribution of second phases — excess phases and precipitates.

Influence of Zr on intergranular corrosion of cast and cryorolled D16 aluminum alloy