Severe plastic deformation (SPD) is one of the most effective methods for producing nanocrystalline (grain size < 100 nm) or ultrafine-grained (100 nm < grain size < 1000 nm) metals and alloys. There are several SPD techniques to synthesize bulk nano- or ultrafine metals (alloys), including equal channel angular pressing (ECAP) and high-pressure torsion (HPT). However, both of these techniques are discontinuous processes and can be applied to fabrication of samples up to certain sizes. Recently, it has been shown the effectiveness of constrained groove pressing or rolling (CGP/R) in reducing the grain size from tens of micrometers to submicrometers in several materials. In our work the applicability of CGP for grain refinement and improvement in mechanical properties of different metals and alloys was studied. The influence of repeated CGP (different number of passes) on the microstructure refinement was investigated by transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). Changes in mechanical properties were measured by tensile and hardness tests and then related to microstructure development.

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