Superplastic behavior of magnesium-based Mg-10 wt % Gd alloy after severe plastic deformation by torsion

Characteristic features of superplastic behavior of Mg-10 wt % Gd alloy with an ultrafine-grained structure produced by severe plastic deformation by high-pressure torsion have been considered. The ultrafine-grained structure has been studied by transmission electron microscopy and X-ray diffraction. The optimum temperature-strain-rate regime of superplastic deformation of the ultrafine-grained alloy and the magnitudes of the strain-rate sensitivity parameter of the flow stress have been determined.