It was reported that the cold and warm press formability of the magnesium alloy was
improved by the application of a differential speed rolling (DSR). However, it can be considered
that the microstructure and the texture of the DSR processed sheets greatly change with the rolling
conditions. In this study, commercial AZ31B magnesium alloy extrusions were processed by DSR
at a differential speed ratio of 1.167 and a reduction per pass of 10% or less, and the effects of the
rolling temperature, the number of rolling passes and reversal of the rolling direction on texture and
mechanical properties were examined. As a result, it was found that the optimal rolling temperature
in terms of the workability and formability of the material was 573 K. And the elongation and
formability were maximal in sheets processed by 4–6 passes of DSR. Moreover, reversing the shear
direction made the microstructure more homogeneous and finer than unidirectional shear, and
improved the mechanical properties and formability. This improvement was greater in samples
where the shear direction was reversed once in the middle than where it was reversed for each pass.