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Influence of magnesium on grain refinement and ductility in a dilute Al-Sc alloy

Furukawa, M., Utsunomiya, A., Matsubara, K., Horita, Z. and Langdon, T.G. (2001) Influence of magnesium on grain refinement and ductility in a dilute Al-Sc alloy Acta Materialia, 49, (18), pp. 3829-3838. (doi:10.1016/S1359-6454(01)00262-2).

Record type: Article

Abstract

Experiments were conducted to determine the influence of magnesium additions on grain refinement and tensile ductility in an Al–0.2% Sc alloy processed by equal-channel angular pressing (ECAP). The experiments show ECAP reduces the average grain size to within the range of ~0.70 to ~0.20 ?m for alloys containing from 0 to 3% Mg but the as-pressed grain size increases to ~0.3 ?m in an alloy with 5% Mg because it is then necessary to use additional annealing treatments during the pressing process. The ultrafine grains introduced by ECAP are stable to high temperatures in the alloys containing from 0 to 3% Mg: in all alloys, the average grain size is <5 ?m after annealing for 1 h at temperatures up to ~750 K. High superplastic ductilities were achieved in the alloy containing 3% Mg but alloys containing 0.5% and 1% Mg exhibited the enhanced ductilities generally associated with conventional Al–Mg alloys. The results suggest the addition of ~ 3% Mg is optimum for achieving superplastic elongations at rapid strain rates in the Al–0.2% Sc alloy.

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More information

Published date: 2001
Keywords: aluminum alloys, high temperature mechanical properties, microstructure, scandium

Identifiers

Local EPrints ID: 23400
URI: http://eprints.soton.ac.uk/id/eprint/23400
ISSN: 1359-6454
PURE UUID: bf214082-e86d-4027-b1dc-a1135c306ad4
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 28 Mar 2006
Last modified: 17 Jul 2017 16:17

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Contributors

Author: M. Furukawa
Author: A. Utsunomiya
Author: K. Matsubara
Author: Z. Horita
Author: T.G. Langdon ORCID iD

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