Effect of Zr on Structure and Resistance to Intergranular Corrosion of Severely Deformed 2024 Aluminum Alloy

Abstract

Effects of severe plastic deformation by isothermal сryorolling with a strain of e~2 and subsequent natural and artificial aging on the structure and resistance to intergranular corrosion (IGC) of the preliminary quenched 2024 aluminum alloy of standard and Zr modified compositions were investigated. Increasing the temperature of aging leads to decreasing the alloy IGC resistance due to precipitation of more stable strengthening S-phase (Al2CuMg), rising difference of electrochemical potentials at grain and subgrain boundaries. Zr additions, оn the opposite, significantly increased the alloy IGC resistance in both naturally and artificially aged conditions, reducing its depth and intensity. The main structural factor, influencing the alloy corrosion behavior, is excess phases: their composition, volume fraction and distribution.

Research on the Mechanical Properties of Some New Aluminum Alloy Composite Structures in Construction Engineering

“…Abioye et al 9) investigated the effect of equal channel angular extrusion (ECAE) on the tensile properties of aluminum alloys and found that it was a method for strengthening them. Krymskiy et al 10) identified composition, volume fraction, and distribution as factors related to the corrosion behavior of aluminum alloys. Mason et al 11) analyzed the impact of process parameters on both microstructure and mechanical response of aluminum alloys, discovering that the overgrowth of reinforcing precipitates could cause sample fracture.…”