Modeling of the work hardening in magnesium alloy sheets

A strain hardening model, based on the generalized Kocks-Mecking approach, is fitted to the observed deformation behavior, including the mechanical anisotropy of the Mg alloy sheets. The model enables the determination of the work hardening coefficient, considering the glide obstacles of both dislocation and non-dislocation origin; the distribution of grain orientations is also considered. The work hardening analysis is applied to the late stage of deformation, where twins are included only as non-dislocation barriers for mobile dislocations.