Flow mechanisms in ultrafine-grained metals with an emphasis on superplasticity
Flow mechanisms in ultrafine-grained metals with an emphasis on superplasticity
An analysis was conducted to examine the flow behavior of ultrafine-grained (UFG) metals produced by severe plastic deformation (SPD) processing in equal-channel angular pressing. The results reveal two distinct types of behavior. At elevated temperatures, the analysis shows that superplastic flow is accurately described by the theoretical mechanism developed for coarse-grained metals so that flow in UFG materials may be interpreted using conventional flow mechanisms. By contrast, localized small-scale grain boundary sliding is observed during deformation at low temperatures and this is attributed to the movement of extrinsic dislocations in the non-equilibrium grain boundaries produced by SPD processing
6624-6629
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Balasubramanian, N.
eb9290dd-f0f0-4237-86d1-ff2f46e396af
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
15 August 2011
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Balasubramanian, N.
eb9290dd-f0f0-4237-86d1-ff2f46e396af
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi, Balasubramanian, N. and Langdon, Terence G.
(2011)
Flow mechanisms in ultrafine-grained metals with an emphasis on superplasticity.
Materials Science and Engineering: A, 528 (21), .
(doi:10.1016/j.msea.2011.05.005).
Abstract
An analysis was conducted to examine the flow behavior of ultrafine-grained (UFG) metals produced by severe plastic deformation (SPD) processing in equal-channel angular pressing. The results reveal two distinct types of behavior. At elevated temperatures, the analysis shows that superplastic flow is accurately described by the theoretical mechanism developed for coarse-grained metals so that flow in UFG materials may be interpreted using conventional flow mechanisms. By contrast, localized small-scale grain boundary sliding is observed during deformation at low temperatures and this is attributed to the movement of extrinsic dislocations in the non-equilibrium grain boundaries produced by SPD processing
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e-pub ahead of print date: 14 May 2011
Published date: 15 August 2011
Organisations:
Bioengineering Group
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Local EPrints ID: 335078
URI: http://eprints.soton.ac.uk/id/eprint/335078
ISSN: 0921-5093
PURE UUID: 93b11ea6-23b8-47f3-83d9-d69b0a920773
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Date deposited: 14 Mar 2012 09:02
Last modified: 15 Mar 2024 03:13
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Author:
Megumi Kawasaki
Author:
N. Balasubramanian
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