Microstructure and mechanical properties of EN AW 6082 aluminium alloy prepared by equal-channel angular pressing
Keywords:EN AW 6082 aluminium alloy, severe plastic deformation, ECAP, mechanical properties, microstructure, deformation strengthening, precipitation
AbstractThe mechanical properties and microstructure of EN AW 6082 aluminium alloy subjected to severe plastic deformation (SPD) and natural ageing are compared with those of extruded and artificially aged state (initial state) and quenched state of alloy after solution annealing. Quenched state of alloy was deformed at room temperature by equal channel angular pressing (ECAP) following route C up to three passes. Polyedric microstructure of quenched state was considerably changed by SPD. Deformation bands with different amount of deformation were observed in microstructure of ECAPed state, which indicated non-uniform deformation across the cross-section of ECAPed specimen. Ultimate tensile strength (UTS) and especially yield strength (0.2% YS) were considerably increased by SPD, but plasticity was decreased. Increase of strength of ECAPed state was first of all evoked by the deformation strengthening.
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