Effect of grain size on the tensile deformation of wrought Mg–MM–Al–Zn–Sn alloy

The effect of grain size on the tensile deformation of Mg–MM–Al–Zn–Sn (EAZT211) alloy sheet has been investigated. Specimens with grain size varying from ~ 10 to ~ 20 μm have been obtained by altering the annealing conditions after rolling. The yield strength of EAZT211 sheet exhibits grain size dependence according to Hall–Petch relationship from room temperature to 200 °C. Occurrence of yield phenomenon and decrease of Hall–Petch slope (k) with increasing strain suggest that non-basal slip system operates during deformation. In addition, deformation mechanism changes from slip mechanism to grain boundary sliding mechanism at ~ 150 °C.