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Application of the Nes Model for Static Recovery of the Dislocation Density in Cold Rolled AA6XXX

An experimental 6XXX series aluminum alloy, Al-0.4Mg-1.2Si-0.49Cu-0.14Mn-0.2Fe(wt.%), was cold rolled 73% and the kinetics of its static recovery studied isochronally between 80 to 350°C, and isothermally at 175 and 205°C. Typical recovery is described by an extrinsic property such as yield stress, however, this study utilized the intrinsic dislocation density extracted from x-ray line profile analysis using a modified Williamson-Hall analysis. The static recovery of dislocation density was fit to the models of Nes [Acta Metall. Mater. 43 (1995) 2189–2207], suggesting that recovery is controlled by the migration of jogged screw dislocations assuming no lateral drift during annealing. The model fit of isothermal annealing at 175°C and 205°C yields activation energies of 0.99 and 1.7 eV/at., respectively. The change in energies can be correlated to an observed change in lattice strain with recovery.