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High-Pressure Torsion (HPT) is widely used to refine the structure of metallic materials through the use of severe plastic deformation. This technique is used in this report to process different magnesium alloys using various processing conditions. The high hydrostatic pressure allows processing of these materials at room temperature without cracking. The structure was characterized and hardness distribution was determined at different areas of the processed samples. The results show significant structure refinement and increased hardness. The evolution of the structure and hardness depends on the alloying and HPT processing conditions.

The processes of severe plastic deformation are being studied for producing ultrafine-grained structures in metallic materials. Among these processes, High-Pressure Torsion, (HPT), is more effective for the grain refinement. The present work aims to observe the effect of pressure variation in the microstructure and the distribution of hardness in samples of AZ31 magnesium processed by HPT. Two disks were processed under pressures of 6.0 GPa and 1.0 GPa to a large number of rotations. The results show the presence of cracks in the sample processed under lower pressure. Also, the microstructure and hardness distribution show heterogeneity in deformation along the longitudinal section.