The processing of bulk metals through the application of severe plastic deformation (SPD) has become important in recent years because of the potential for achieving remarkable grain refinement to the submicrometer or nanometer range. Several different SPD procedures are now available but the most attractive, and the ones receiving the major attention, are equal-channel angular pressing (ECAP) and high-pressure torsion (HPT). Both of these procedures are effective in introducing a high density of dislocations into the samples and these dislocations then subsequently re-arrange to form an ultrafine-grained microstructure. Many of the materials processed by SPD techniques exhibit excellent properties. For example, the exceptional grain refinement often leads to very significant strengthening at ambient temperatures and, if the grains remain reasonably small when the temperature is increased, there is a potential for achieving excellent superplastic properties at elevated temperatures. This presentation examines recent developments in the processing of materials using SPD.

  

 

Terence G. Langdon is Research Professor and Director of the Centre for Bulk Nanostructured Materials in the School of Engineering Sciences at the University of Southampton and the William E. Leonhard Professor of Engineering in the Viterbi School of Engineering at the University of Southern California.  He is a Fellow of the Royal Academy of Engineering and a Member of the European Academy of Sciences.   His awards include the Somiya Award from the International Union of Materials Research Societies, the degree of Doctor honoris causa from the Russian Academy of Sciences, the Albert Sauveur Achievement Award from ASM International and the Blaise Pascal Medal from the European Academy of Sciences.  He has published over 500 papers in peer-reviewed journals which have received more than 18,000 citations.  He has an h-index of 70 which means that 70 of the publications each have at least 70 citations.