This book addresses all aspects of the science and technology of ultrafine grained materials produced by Severe Plastic Deformation (SPD) techniques. It presents fundamental issues in SPD processing and SPD-processed materials, processing and microstructures, microstructural evolution, mechanical and physical properties, superplasticity, computational and analytical modeling, new SPD technologies and advances, and structural applications. From the 2006 TMS Annual Meeting, held March 12-16, 2006, in San Antonio, Texas.About the Author: Michael Zehetbauer research focuses on severe plastic deformation of metals and the characterization of ultrafine grained and/or nanocrystalline structures by X-ray and synchrotron radiation. He was organizer of the Second International Conference on Nanomaterials by Severe Plastic Deformation, held in Vienna in 2003. Yuntian T. Zhu work concentrates on processing and characterization of bulk nanostructured materials and he is also active in research related to carbon nanotubes. Yuntian Zhu was co-organizer of four symposia on ultrafine grained materials.