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New Hot Paper Comments

By Ruslan Z. Valiev

ESI Special Topics, July 2007
Citing URL - http://www.esi-topics.com/nhp/2007/july-07-RuslanZValiev.html

A closer look at the work of Ruslan Z. Valiev.Ruslan Z. Valiev answers a few questions about this month's new hot paper in the field of Materials Science. The author has also sent along images of their work.


From •>>July 2007

Field: Materials Science
Article Title: Producing bulk ultrafine-grained materials by severe plastic deformation
Authors: Valiev, RZ;Estrin, Y;Horita, Z;Langdon, TG;Zehetbauer, MJ;Zhu, YTT
Journal: JOM
Volume: 58
Issue: 4
Page: 33-39
Year: APR 2006
* Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa, Russia.
* Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa, Russia.
* Tech Univ Clausthal, Inst Mat Sci & Technol, D-3392 Clausthal Zellerfeld, Germany.
* Kyushu Univ, Fac Engn, Dept Mat Sci & Engn, Fukuoka, Japan.
* Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA USA.
* Univ So Calif, Dept Mat Sci, Los Angeles, CA USA.
* Univ Vienna, Dept Phys Mat, Vienna, Austria.
* Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM USA.

ST:  Why do you think your paper is highly cited?

In the authors’ opinion, the paper is highly cited because it is devoted to the rapidly growing and up-to-date subject of nanostructuring of metals and alloys by means of severe plastic deformation (SPD) techniques. The paper also introduces and discusses some essential terms and definitions. The problem of precise term meanings has always been important for scientists and researchers, especially in the context of a new and developing branch of knowledge.

ST:  Does it describe a new discovery, methodology, or synthesis of knowledge?

¦click photo for larger image¦

Members of the NanoSPD International Steering Committee. Shown in the photo are (from left) Zenji Horita, Michael Zehetbauer, Ruslan Valiev, Yuri Estrin, Yuntian Zhu and Terence Langdon.


“The important contribution is that the paper discusses and formally defines the proper terminology to be used in this research area.”


The paper describes new trends in the field of bulk ultrafine-grained materials produced by SPD techniques and it highlights recent achievements and possible new directions in this developing sphere of modern materials science. An important contribution is that the paper discusses and formally defines the proper terminology to be used in this research area.

ST:  Would you summarize the significance of your paper in layman’s terms?

It is probable that a rather wide audience will find this paper valuable as it provides a historical background of the issues and outlines future prospects for this research area including topical innovation developments. Bulk nanostructured materials have emerged over the last 20 years as significant structural materials, offering the potential for achieving remarkable physical and functional properties.

ST:  How did you become involved in this research, and were there any particular problems encountered along the way?

The last decade has witnessed significantly growing interest in the processing of bulk ultrafine-grained materials, although certain aspects of this research area lacked a clear and properly defined terminology. This omission prompted the six members of the International NanoSPD Steering Committee to collaborate in preparing the present paper.

One of the main problems is that the new trends described in the paper are continuing to develop and are attracting new people who are not fully conversant with the background of the field. Accordingly, the problem of terminology will require close and continuous attention as rapidly changing developments may necessitate changes in the existing terms or definitions.

ST:  Where do you see your research leading in the future?

Nanostructuring of metals through the application of SPD techniques leads to a dramatic enhancement of their mechanical properties. Therefore, it may provide the development of metallic materials during the next generation that should find applications in various branches of engineering, the power industry, and medicine.

ST:  Are there any social or political implications for your research?

It will be important to establish SPD processing as the basis for the commercial production of semi-products and products with UFG structures using a wide range of metals and alloys. Numerous applications may be anticipated for nanometals with superior mechanical properties in various industries, including transportation, medical devices, electronics, etc.End

Professor Ruslan Valiev
Scientific Director of the Institute of Physics of Advanced Materials
Ufa Sate Aviation Technical University
Ufa, Russia


A Closer Look...

A closer look... Below are images sent in by Ruslan Z. Valiev which correspond with the featured paper, or current research.

Figure 1:

Figure 1:

Unique strength and ductility of the nanostructured metals compared with coarse-grained metals. Conventional cold-rolling of copper and aluminium increases their yield strength but decreases their ductility. The two lines represent this tendency for Cu and Al and the % markings indicate a percentage on rolling. In contrast, the extraordinary high strength and ductility of nanostructured Cu and Ti clearly set them apart from coarse-grained metals [R. Valiev. Nature Materials, 2004, vol.3, pp.511-516].  

  

  

Figure 2:

Figure 2:

The principle of equal channel angular pressing (ECAP) which is at present the most developed processing technique for producing ultrafine-grained material [R.Z. Valiev, T.G. Langdon, Progress in Materials Science, 2006, vol. 51, pp.881-981].  

  

  

Figure 3:

Figure 3:

Integrated ECAP/extrusion process: (a) Die design combining two ECAP passes (channel angle 120 degrees) and a final extrusion step; (b) Possible product profile produced in the exit channel of the die [R.Z. Valiev, M. Zehetbauer, Yu. Estrin, H.W. Höppel, Yu. Ivanisenko, H. Hahn, G. Wilde, H.J. Roven, X. Sauvage and T.G. Langdon, Advanced Engineering Materials, 2007, in press].  

     

ESI Special Topics, July 2007
Citing URL - http://www.esi-topics.com/nhp/2007/july-07-RuslanZValiev.html

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