DEFORMATION OF TITANIUM BY THE HIGH PRESSURE TORSION METHOD

This work is devoted to one of the most important problems of modern physics of strength and plasticity – to the behavior of metals under various conditions of intense external influences. These are large plastic deformations, the formation of nanocrystalline structures under these conditions, complex cooperative dynamic processes in the zones of deformation localization, low temperatures or high deformation rates, highstrength materials, etc. The relevance of this problem is due to the use of intensive external influences in numerous new technologies for obtaining and processing metal materials. To implement the high-pressure torsion process on a hydraulic single-column press, a special design matrix has been developed that allows the high-pressure torsion process to be implemented due to the linear movement of the striker relative to the frame. For investigation of this process, a FEM simulation using Deform program was used. Results of the study of the strain state showed that after 10 deformation cycles the average strain value is about 3,8. Results of the study of the stress state showed that compressive stresses prevail in the deformation zone. The tensile stresses are concentrated mainly on the periphery of the workpiece, its value is about 1080 MPa. Despite of high level of tensile stresses the value of compressive stresses is more than 3 times.