
This is the third edition of the special issue Severe Plastic Deformation for Production of Ultrafine Structures and Unusual Mechanical Properties. The first edition was published in the January issue of Vol. 49, 2008 under the subtitle Investigating Role of High-Density Lattice Defects and the second edition in the January issue of Vol. 50, 2009 under the subtitle Understanding Mechanism. The third edition was then planned with Aiming Breakthrough in Materials Development. The strength and the ductility are generally in a tradeoff relation in metallic materials and simultaneous achievement of both properties is very difficult. Breakthrough for this problem is an important issue to be investigated. As has been suggested in the earlier editions, microstrctural refinement by severe plastic deformation (SPD) is a good approach for this solution. This issue has been edited with papers related to microstructural refinement and mechanical property enhancement using SPD processes. Papers have been collected not only from experimental studies but also computational simulation and modeling. As in the second edition, this issue has provided comparison between the results from both approaches.
We are hoping that this special issue promotes research activity in the field of materials science and technology. The current edition includes application of the SPD processes to various materials, demonstrating the versatility of the processes. Although each article deals with fundamental research, we believe that a more practical outcome will emerge in the near future.
Finally, we would like to thank all authors for contribution to this special issue presenting latest information from their research work. We are also very grateful for the reviewers who spent their valuable time to provide many useful comments and suggestions.
November 21, 2009
(Received ; Accepted ; Published )
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© 2010 The Japan Institute of Metals
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