Developing superplasticity in ultrafine-grained metals
Developing superplasticity in ultrafine-grained metals
The processing of bulk metals through the application of severe plastic deformation provides an opportunity for achieving exceptional grain refinement with grain sizes typically lying in the submicrometer or even the nanometer range. Provided these small grains are reasonably stable at elevated temperatures, these ultrafine-grained metals will exhibit excellent superplastic properties when pulled in tension at elevated temperatures. Most ultrafine-grained materials have been produced using either equal-channel angular pressing or high-pressure torsion. This paper examines the results for superplasticity reported to date using metallic alloys processed by equal-channel angular pressing and high-pressure torsion, compares the experimental strain rates with those predicted using the theoretical model for conventional superplastic flow and then demonstrates the feasibility of preparing deformation mechanism maps that provide comprehensive information on the flow mechanisms.
superplasticity, ultrafine, grained, metals
470-478
Kawasaki, M.
d0ce18b9-8403-4db2-9cb2-3a6165f288a6
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
September 2015
Kawasaki, M.
d0ce18b9-8403-4db2-9cb2-3a6165f288a6
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, M. and Langdon, T.G.
(2015)
Developing superplasticity in ultrafine-grained metals.
Acta Physica Polonica A, 128 (4), .
(doi:10.12693/APhysPolA.128.470).
Abstract
The processing of bulk metals through the application of severe plastic deformation provides an opportunity for achieving exceptional grain refinement with grain sizes typically lying in the submicrometer or even the nanometer range. Provided these small grains are reasonably stable at elevated temperatures, these ultrafine-grained metals will exhibit excellent superplastic properties when pulled in tension at elevated temperatures. Most ultrafine-grained materials have been produced using either equal-channel angular pressing or high-pressure torsion. This paper examines the results for superplasticity reported to date using metallic alloys processed by equal-channel angular pressing and high-pressure torsion, compares the experimental strain rates with those predicted using the theoretical model for conventional superplastic flow and then demonstrates the feasibility of preparing deformation mechanism maps that provide comprehensive information on the flow mechanisms.
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Published date: September 2015
Keywords:
superplasticity, ultrafine, grained, metals
Organisations:
Engineering Mats & Surface Engineerg Gp, Engineering Science Unit, Faculty of Engineering and the Environment
Identifiers
Local EPrints ID: 386298
URI: http://eprints.soton.ac.uk/id/eprint/386298
ISSN: 1898-794X
PURE UUID: f81ba9b1-4da8-488c-8287-7392ac2cffb7
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Date deposited: 29 Jan 2016 15:37
Last modified: 15 Mar 2024 03:14
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Author:
M. Kawasaki
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