An analysis of superplastic flow after processing by ECAP
An analysis of superplastic flow after processing by ECAP
Processing by equal-channel angular pressing (ECAP), when carried out optimally, produces submicrometer grain sizes, arrays of equiaxed grains and a significant fraction of high-angle grain boundaries. These conditions are appropriate for achieving high strain rate and/or low temperature superplasticity. This paper reviews experimental results describing superplastic flow in an Al–Mg–Sc alloy after ECAP. It is shown that the experimental data are in good agreement with a model for superplasticity developed for conventional superplastic alloys and based on grain boundary sliding accommodated by the intragranular flow of dislocations. In addition, an analysis shows the region of superplastic flow lies very close to, or even exceeds, the predicted transition between the viscous glide of dislocations and the breakaway of dislocations from their solute atmospheres.
aluminum alloys, creep mechanisms, equal-channel angular pressing, grain boundary sliding, superplasticity
476-479
Balasubramanian, N.
eb9290dd-f0f0-4237-86d1-ff2f46e396af
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
2005
Balasubramanian, N.
eb9290dd-f0f0-4237-86d1-ff2f46e396af
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Balasubramanian, N. and Langdon, Terence G.
(2005)
An analysis of superplastic flow after processing by ECAP.
Materials Science and Engineering: A, 410-411, .
(doi:10.1016/j.msea.2005.08.090).
Abstract
Processing by equal-channel angular pressing (ECAP), when carried out optimally, produces submicrometer grain sizes, arrays of equiaxed grains and a significant fraction of high-angle grain boundaries. These conditions are appropriate for achieving high strain rate and/or low temperature superplasticity. This paper reviews experimental results describing superplastic flow in an Al–Mg–Sc alloy after ECAP. It is shown that the experimental data are in good agreement with a model for superplasticity developed for conventional superplastic alloys and based on grain boundary sliding accommodated by the intragranular flow of dislocations. In addition, an analysis shows the region of superplastic flow lies very close to, or even exceeds, the predicted transition between the viscous glide of dislocations and the breakaway of dislocations from their solute atmospheres.
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Published date: 2005
Additional Information:
The Langdon Symposium: Flow and forming of Crystalline Materials
Keywords:
aluminum alloys, creep mechanisms, equal-channel angular pressing, grain boundary sliding, superplasticity
Organisations:
Engineering Sciences
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Local EPrints ID: 23811
URI: http://eprints.soton.ac.uk/id/eprint/23811
ISSN: 0921-5093
PURE UUID: 98056d71-b213-4e6f-9926-c0df20284108
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Date deposited: 21 Mar 2006
Last modified: 16 Mar 2024 03:28
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Author:
N. Balasubramanian
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