Using X-ray microtomography to evaluate cavity formation in a superplastic magnesium alloy processed by equal-channel angular pressing
Using X-ray microtomography to evaluate cavity formation in a superplastic magnesium alloy processed by equal-channel angular pressing
The magnesium AZ31 alloy exhibits excellent superplastic properties after processing by equal-channel angular pressing (ECAP) and testing in tension at a temperature of 623 K. Experiments show that there is an increase in the elongations to failure with increasing numbers of passes in ECAP. X-ray microtomography was used to obtain detailed information on the morphologies of cavities developed during superplastic flow and the results were analyzed in terms of the different possible cavity growth mechanisms. The results show that superplastic elongations are attained in this alloy because the finer grain structure introduced by ECAP is associated with lower flow stresses in tensile testing at elevated temperatures and this leads to a reduction in the rate of growth of internal cavities.
cavitation, equal-channel angular pressing, magnesium alloys, superplasticity, x-ray
5737-5748
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Terzi, Sofiane
79281427-d306-4483-bce8-3336dc4e496d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
2010
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Terzi, Sofiane
79281427-d306-4483-bce8-3336dc4e496d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Figueiredo, Roberto B., Terzi, Sofiane and Langdon, Terence G.
(2010)
Using X-ray microtomography to evaluate cavity formation in a superplastic magnesium alloy processed by equal-channel angular pressing.
Acta Materialia, 58 (17), .
(doi:10.1016/j.actamat.2010.06.049).
Abstract
The magnesium AZ31 alloy exhibits excellent superplastic properties after processing by equal-channel angular pressing (ECAP) and testing in tension at a temperature of 623 K. Experiments show that there is an increase in the elongations to failure with increasing numbers of passes in ECAP. X-ray microtomography was used to obtain detailed information on the morphologies of cavities developed during superplastic flow and the results were analyzed in terms of the different possible cavity growth mechanisms. The results show that superplastic elongations are attained in this alloy because the finer grain structure introduced by ECAP is associated with lower flow stresses in tensile testing at elevated temperatures and this leads to a reduction in the rate of growth of internal cavities.
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Published date: 2010
Keywords:
cavitation, equal-channel angular pressing, magnesium alloys, superplasticity, x-ray
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 170855
URI: http://eprints.soton.ac.uk/id/eprint/170855
ISSN: 1359-6454
PURE UUID: a3221c7c-5a5c-407f-927c-00fd509c921e
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Date deposited: 11 Jan 2011 10:32
Last modified: 14 Mar 2024 02:47
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Author:
Roberto B. Figueiredo
Author:
Sofiane Terzi
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