Evolution of microstructure and microtexture in fcc metals during high-pressure torsion
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Authors
Zhilyaev, A.P.
McNelley, T.R.
Langdon, T.G.
Subjects
Advisors
Date of Issue
2007
Date
Publisher
Elsevier
Language
Abstract
Pure nickel and commercially pure (CP) aluminium were selected as model fcc materials for
a detailed investigation of the experimental parameters influencing grain refinement and evolution
of micro- structure and microtexture during processing by high- pressure torsion (HPT). Samples
were examined after HPT using microhardness measurements, transmission electron microscopy and
orientation imaging micros- copy. Processing by HPT produces a grain size of ~170 nm in pure Ni and ~1 lm in CP aluminium. It is shown that homogeneous and equiaxed microstructures can be attained throughout the samples of nickel when using applied pressures of at least ~6 GPa after 5 whole revolution. In CP aluminium, a homogeneous and equiaxed microstructure was achieved after
2 whole revolutions under an applied pressure of 1 GPa. For these conditions, the distributions of
grain boundary misorientations are similar in the centre and at the periphery of the samples. It is
shown that simple shear texture develops in fcc metals subjected to high-pressure torsion. Some grain growth was detected at the periphery of the Al disk after 8 revolutions. The factors influencing the
development of homogeneous microstructures in processing by HPT are discussed.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1007/s10853-006-0628-0
Series/Report No
Department
Mechanical and Astronautical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
National Research Council of the National Academy of Science (USA)
Spanish Ministry of Education and Science
U.S. Air Force Office of Scientific Research (AFOSR)
National Science Foundation (NSF)
Spanish Ministry of Education and Science
U.S. Air Force Office of Scientific Research (AFOSR)
National Science Foundation (NSF)
Funder
INTAS-03513779
RFBR-05-03-32233-a
FIATA06058G001 (TRM) (AFOSR)
Grant no. DMR-0243331 (TGL) (NSF)
RFBR-05-03-32233-a
FIATA06058G001 (TRM) (AFOSR)
Grant no. DMR-0243331 (TGL) (NSF)
Format
12 p.
Citation
A.P. Zhilyaev, T.R. McNelley, T.G. Langdon, "Evolution of microstructure and microtexture in fcc metals during high-pressure torsion," Journal of Materials Science, v.42, (2007) , pp. 1517-1528.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.