A microstructure-based model for describing strain softening during compression of Al-30%wt Zn alloy

M Borodachenkova, J Gracio, R Picu, F Barlat


A microstructural-based model, describing the plastic behavior of Al-30wt% Zn alloy, is proposed and the effect of solid solution decomposition, Orowan looping, twinning and grain refinement is analyzed. It is assumed that the plastic deformation process is dominated by strain-induced solute diffusion and dislocation motion. To capture the essential physics, a law describing the evolution of the mean free path of dislocations with plastic strain is proposed which reproduces the experimentally observed strain softening.

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DOI: http://dx.doi.org/10.1260/1750-9548.7.1.77

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