By Ruslan Z. Valiev
ESI Special Topics,
July 2007
Citing URL - http://www.esi-topics.com/nhp/2007/july-07-RuslanZValiev.html
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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.
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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.
Does
it describe a new discovery, methodology, or synthesis of knowledge?
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¦click
photo for larger image¦ |
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“The important contribution is that the paper
discusses and formally defines the proper terminology to be used
in this research area.” |
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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.
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.
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.
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.
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.
Professor Ruslan Valiev
Scientific Director of the Institute of Physics of Advanced
Materials
Ufa Sate Aviation Technical University
Ufa, Russia
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A Closer Look...
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Below
are images sent in by Ruslan Z. Valiev which correspond with the featured
paper, or current research. |
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Figure
1:
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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]. |
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Figure
2:
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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]. |
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Figure
3:
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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]. |
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ESI Special Topics,
July 2007
Citing URL - http://www.esi-topics.com/nhp/2007/july-07-RuslanZValiev.html
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