Microstructural evolution in immiscible alloys processed by High-Pressure Torsion

Abstract

The application of High-Pressure Torsion (HPT) to two different Co-Cu alloys permits the generation of materials with nanocrystalline grain sizes. The evolution of the microstructure with increasing strain and the resulting microstructure are investigated by scanning electron microscopy. The final attainable grain sizes are significantly smaller than in corresponding pure metals deformed by HPT. Special attention is given on microstructural evolution and deformation behavior of the Cu and Co phases revealing the importance of nature, morphology and deformation behavior of the single phases on the formation of nanocrystalline structures during HPT processing.