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Influence of scandium on superplastic ductilities in an Al-Mg-Sc alloy

Influence of scandium on superplastic ductilities in an Al-Mg-Sc alloy
Influence of scandium on superplastic ductilities in an Al-Mg-Sc alloy
Ultrafine grain sizes, of the order of approximately 0.2 ?m, may be introduced into Al-Mg-Sc alloys by subjecting the material to severe plastic deformation through the process of equal-channel angular pressing (ECAP). Experiments were conducted to evaluate the influence of the solution treatment temperature on the ductility of an Al-3% Mg-0.2% Sc alloy after ECAP. The results show the highest ductilities are achieved when the solution treatment temperature is within the narrow range of approximately 878 to about 883 K, immediately below the temperature associated with the onset of partial melting. These high temperatures serve to maximize the amount of scandium in solid solution and this leads, on subsequent heating, to an extensive precipitation of fine secondary Al3Sc particles which inhibit grain growth at the higher temperatures. Conversely, solution treatments at temperatures below approximately 878 K give less Sc in solid solution within the matrix and the precipitation of the Al3Sc particles is then insufficient to retain a uniform ultrafine microstructure.
2571-2576
Komura, S.
ed6e34ef-beb3-45d4-9836-dfc3bdbdafce
Horita, Z.
84a80017-cbaf-4713-8346-6f69ac7ea63e
Furukawa, M.
8ea754fa-cd31-481d-b6b7-6a6968b1ee0e
Nemoto, M.
37afe672-c5b3-4566-a16b-42e031d64b2d
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Komura, S.
ed6e34ef-beb3-45d4-9836-dfc3bdbdafce
Horita, Z.
84a80017-cbaf-4713-8346-6f69ac7ea63e
Furukawa, M.
8ea754fa-cd31-481d-b6b7-6a6968b1ee0e
Nemoto, M.
37afe672-c5b3-4566-a16b-42e031d64b2d
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Komura, S., Horita, Z., Furukawa, M., Nemoto, M. and Langdon, T.G. (2000) Influence of scandium on superplastic ductilities in an Al-Mg-Sc alloy. Journal of Materials Research, 15 (11), 2571-2576. (doi:10.1557/JMR.2000.0367).

Record type: Article

Abstract

Ultrafine grain sizes, of the order of approximately 0.2 ?m, may be introduced into Al-Mg-Sc alloys by subjecting the material to severe plastic deformation through the process of equal-channel angular pressing (ECAP). Experiments were conducted to evaluate the influence of the solution treatment temperature on the ductility of an Al-3% Mg-0.2% Sc alloy after ECAP. The results show the highest ductilities are achieved when the solution treatment temperature is within the narrow range of approximately 878 to about 883 K, immediately below the temperature associated with the onset of partial melting. These high temperatures serve to maximize the amount of scandium in solid solution and this leads, on subsequent heating, to an extensive precipitation of fine secondary Al3Sc particles which inhibit grain growth at the higher temperatures. Conversely, solution treatments at temperatures below approximately 878 K give less Sc in solid solution within the matrix and the precipitation of the Al3Sc particles is then insufficient to retain a uniform ultrafine microstructure.

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More information

Published date: November 2000
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 48653
URI: http://eprints.soton.ac.uk/id/eprint/48653
PURE UUID: 58de9e78-732e-4ebe-b54f-2be6b97000da
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 08 Nov 2007
Last modified: 16 Mar 2024 03:28

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Contributors

Author: S. Komura
Author: Z. Horita
Author: M. Furukawa
Author: M. Nemoto
Author: T.G. Langdon ORCID iD

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