Abstract
At present technologies of production of ultra-fine grained (UFG) metallic materials and subsequently of semis are being used in broader extent both in pilot plants and in industrial practice. Amount of investments necessary for realisation of industrial equipment and afterwards for industrial production is from this viewpoint a critical factor. Research and development works are now focused primarily on enhancement of efficiency of SPD process, which is the core of all these manufacturing technologies. The paper presents comparison of classical geometry of the ECAP tool with the newly designed geometry of the output channel of the ECAP tool (helix). This geometry enables substantial enhancement of efficiency of SPD process. The process was applied to the alloy AlMn1Cu. Necessary refinement of grain was achieved with smaller number of passes.