Abstract
Bulk nanostructured materials can be prepared using a variety of severe plastic deformation methods. These can be grouped into two general categories, discrete powder methods (e.g., cryomilling and cold finger deposition) and solid state transformation methods (e.g., equi-channel pressing). Powder consolidation methods provide benefits, such as control of grain size distribution, resistance against grain growth and scale-up potential; however, some disadvantages include contamination and incomplete particle bonding which can lead to porosity. In this study, we use spark plasma sintering (SPS) and high pressure torsion to synthesize bulk dense nanostructured Cu. The Cu powders, with an average grain size of 20 nm, were prepared via cryomilling in liquid nitrogen. High-pressure SPS is used to prepare bulk NS Cu. In addition, high pressure torsion was used to consolidate dense NS Cu at its super-plasticity regime. Mechanical properties and microstructures are measured and compared with particular emphasis on operative deformation mechanisms.(Id like to be considered for the Young Scientist Session)