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The dominant active slip systems during plastic deformation of an extruded Mg-4.5Zn (wt.%) alloy with and without β1′ precipitates were investigated by means of advanced electron back-scattered diffraction techniques and transmission electron microscopy. Planar slip traces were found in 92% of the grains with slip traces in the sample without precipitates and, among them, the primary active slip systems were basal slip and pyramidal II slip. However, non-planar slip traces were observed in 76% of the grains with slip traces in the sample with precipitates, and among them, prismatic slip exhibited the highest activity, followed by pyramidal II slip. The change in the dominant active slip systems with precipitation was attributed to the strong hardening induced by β1′ precipitates on basal slip. This favoured the cross-slip of basal slip dislocations to prismatic plane and plastic deformation progressed by the glide of prismatic slip dislocations parallel to the precipitates.
Yang et al. (Fri,) studied this question.