Perspectives of Scaling up of Severe Plastic Deformation: A Case of High Pressure Torsion Extrusion

A demand for cheap and simple methods of processing nanocrystalline materials attracted attention to metal forming techniques allowing introduction large strains into metallic materials. Thanks that a new scientific field, “Materials by severe plastic deformation”, had been born became an important segment material science. High pressure torsion (HPT) is the most effective SPD method in respect microstructure refinement costs. Despite attractive mechanical physical properties demonstrated HPT-processed materials, this technique cannot be used industry due limited size processed samples. To overcome problem, plenty methods, large-scale billets, was developed. However, none them has found any application industry, except few cases, which are rather exceptions confirm rule. This overview attempt analyze reasons why industrial players remain reluctant use technological processes. For purpose, advantages drawbacks Pressure Torsion Extrusion regarded.