Analysis of the activity of {1 1 0}〈1 1 0〉 slip in AA3103 by inverse modeling

It is commonly accepted that during high temperature deformation of aluminum polycrystals the slip activity on {1 1 0}〈1 1 0〉 slip systems causes a stabilization of Cube textures. This was investigated quantitatively in this study. Analysis of numerous deformation textures after plane strain compression tests of AA3103 aluminum at different temperatures, strain rates and strains revealed that slip activity on {1 1 0}〈1 1 0〉 systems does not only depend on temperature, but on strain rate as well. The ratio of the critical resolved shear stress (CRSS) on {1 1 0}〈1 1 0〉 slip systems to the CRSS on {1 1 1}〈1 1 0〉 slip systems (r1 1 0) determines the partitioning of slip between the two slip system families. By variation of r1 1 0 in the deformation texture model GIA the evolution of Cube texture could be modeled satisfactorily for all deformation conditions. The ratio r1 1 0 was found to scale with ln Z where Z is the Zener–Hollomon parameter. This dependency enables predictions for any deformation condition. The activation energy for slip on {1 1 0}〈1 1 0〉 systems was determined to be approximately 2.5 eV. This is attributed to thermally activated cross slip according to the kink-pair mechanism of Carrard and Martin and additional diffusion control of dislocation kinetics by Mn in solid solution. Increasing Mn content was found to disfavor the activation of slip on {1 1 0}〈1 1 0〉 systems.