Plastic Deformation Induced Nanocrytstallization

Prof M. H. Enayati obtained his PhD in Material Science from Oxford University, UK in 1999. Over the last twenty years, his research was mainly focused on nanostructured (nanocrystalline materials & nanocomposites) and amorphous materials. Prof  Enayati thrived to publish over 200 peer-reviewed articles, including 3 review papers, in worldwide reputed journals and participated in numerous national and well-known international conference presentations . His research has been recognized with several awards, most recently from the Iran Nanotechnology Initiative Council and Isfahan University of Technology. Prof  Enayati  is a Fellow (FIMMM) of Institute of Materials, Minerals and Mining, UK and has been ranked among the top 1% most cited world’s leading scientists according to Thomson Reuters’s Essential Science Indicators database.

Plastic Deformation Induced Nanocrytstallization

Abstract:

Vapour deposition, plasma processing, gas-condensation, chemical precipitation and crystallisation from the amorphous phase are well established processing routes for obtaining nanocrystalline materials. However, it is well known that mechanical deformation, as a top-down solid-state synthesis route, can also be applied for production of a nanocrystalline structure. Comparison of different preparation methods in terms of cost and productivity demonstrates that mechanical deformation is the most cost effective route capable of producing nanocrystalline materials in large quantity. Grain refinement to the nanometre size is governed by the plastic deformation induced during mechanical working. In general, the grain/crystallite size decreases continuously with number of deformation cycles until a minimum (saturation) size is approached. Further refinement seems to be difficult to achieve for a fixed set of experimental conditions. In this talk the most relevant features of different techniques for producing nanocrystalline materials based of mechanical deformation are overviewed and discussed.