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

M. Markushev, S. Krymskiy, R. Ilyasov, E. Avtokratova, A. Khazgalieva, O. Sitdikov
Received: 23 October 2017; Accepted: 01 November 2017
Citation: M. Markushev, S. Krymskiy, R. Ilyasov, E. Avtokratova, A. Khazgalieva, O. Sitdikov. Influence of Zr on intergranular corrosion of cast and cryorolled D16 aluminum alloy. Letters on Materials, 2017, 7(4) 447-451
BibTex   DOI: 10.22226/2410-3535-2017-4-447-451

Abstract

Effects of severe plastic deformation by isothermal сryorolling at a temperature of liquid nitrogen with a strain of e~2 and subsequent natural and artificial aging on the evolution of structure, hardness and resistance to intergranular corrosion (IGC) of the preliminary quenched D16 aluminum alloys of conventional and Zr modified compositions, were investigated. It was concluded that the main factors, determining the alloy microstructure changes, mechanical and corrosion behavior, are the volume fraction and morphology, and spatial distribution of second phases - excess phases and precipitates.Effects of severe plastic deformation by isothermal сryorolling at a temperature of liquid nitrogen with a strain of e~2 and subsequent natural and artificial aging on the evolution of structure, hardness and resistance to intergranular corrosion (IGC) of the preliminary quenched D16 aluminum alloys of conventional and Zr modified compositions, were investigated. It was found that the natural aging of alloys had slight effect on corrosion resistance due to formation of Guinier-Preston-Bagaratsky zones. Because of their coherency to matrix, difference in their electrochemical potential was low, causing slight effect on corrosion resistance. Artificial aging to the maximum strength, performed at 190ºC for 12 hrs in accordance to conventional T1 route, in both rolled and non-rolled states of the alloys of both compositions led to strong decrease of IGC resistance due to precipitation of strengthening phases instead of zones, formed at natural aging. Modification of the 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 studied. It was concluded that the main factors, determining the alloy microstructure changes, mechanical and corrosion behavior, are the volume fraction and morphology, and spatial distribution of second phases - excess phases and precipitates.

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