Grain boundary sliding revisited: developments in sliding over four decades
Grain boundary sliding revisited: developments in sliding over four decades
It is now recognized that grain boundary sliding (GBS) is often an important mode of deformation in polycrystalline materials. This paper reviews the developments in GBS over the last four decades including the procedures available for estimating the strain contributed by sliding to the total strain, ?, and the division into Rachinger GBS in conventional creep and Lifshitz GBS in diffusion creep. It is shown that Rachinger GBS occurs under two distinct conditions in conventional creep depending upon whether the grain size, d, is larger or smaller than the equilibrium subgrain size, ?. A unified model is presented leading to separate rate equations for Rachinger GBS in power-law creep and superplasticity. It is demonstrated that these two equations are in excellent agreement with experimental observations. There are additional recent predictions, not fully resolved at the present time, concerning the role of GBS in nanostructured materials.
597-609
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
2006
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Langdon, Terence G.
(2006)
Grain boundary sliding revisited: developments in sliding over four decades.
Journal of Materials Science, 41 (3), .
(doi:10.1007/s10853-006-6476-0).
Abstract
It is now recognized that grain boundary sliding (GBS) is often an important mode of deformation in polycrystalline materials. This paper reviews the developments in GBS over the last four decades including the procedures available for estimating the strain contributed by sliding to the total strain, ?, and the division into Rachinger GBS in conventional creep and Lifshitz GBS in diffusion creep. It is shown that Rachinger GBS occurs under two distinct conditions in conventional creep depending upon whether the grain size, d, is larger or smaller than the equilibrium subgrain size, ?. A unified model is presented leading to separate rate equations for Rachinger GBS in power-law creep and superplasticity. It is demonstrated that these two equations are in excellent agreement with experimental observations. There are additional recent predictions, not fully resolved at the present time, concerning the role of GBS in nanostructured materials.
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Published date: 2006
Additional Information:
40th anniversary issue, guest editor M. Grant Norton
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 43644
URI: http://eprints.soton.ac.uk/id/eprint/43644
ISSN: 0022-2461
PURE UUID: 077cdd51-c814-4982-9c21-7e9364dce843
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Date deposited: 29 Jan 2007
Last modified: 16 Mar 2024 03:28
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