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Influence of scandium and zirconium on grain stability and superplastic ductilities in ultrafine-grained Al-Mg alloys

Influence of scandium and zirconium on grain stability and superplastic ductilities in ultrafine-grained Al-Mg alloys
Influence of scandium and zirconium on grain stability and superplastic ductilities in ultrafine-grained Al-Mg alloys
Experiments were conducted to evaluate the grain refinement introduced by equal-channel angular pressing (ECAP) in three different Al–3% Mg alloys containing either 0.2% Sc, 0.2% Zr or a combination of 0.2% Sc and 0.12% Zr. The results show all three alloys exhibit significant grain refinement with as-pressed grain sizes in the range of ~0.2–0.3 µm. Tensile testing after ECAP revealed superplastic ductilities in the Al–Mg–Sc–Zr and Al–Mg–Sc alloys at strain rates in the vicinity of ~10-2 s-1 at temperatures of 573 and 673 K but superplasticity was not achieved in the Al–Mg–Zr alloy due to the onset of rapid grain growth at 573 K. At the higher temperature of 773 K, the Al–Mg–Sc–Zr alloy exhibited exceptional superplastic ductilities but superplasticity was no longer achieved in the Al–Mg–Sc alloy. This difference was due to extensive grain growth in the Al–Mg–Sc alloy at temperatures in the vicinity of 773 K whereas the ultrafine-grained microstructure in the Al–Mg–Sc–Zr alloy was stable at this high temperature due to the presence of stable Al3(ZrxSc1-x) precipitates.
aluminum alloys, equal-channel angular pressing, mechanical properties (high temperature)
1359-6454
553-564
Lee, S.
5c554804-da3a-4842-a78a-94a77c0bbe6b
Utsunomiya, A.
c1e75ca6-9661-4efc-b10b-c8089677cb41
Akamatsu, H.
c5533033-c4cc-48c2-843c-00b98257f5f3
Neishi, K.
329e3a20-a14f-44e7-aef8-825a47da065e
Furukawa, M.
8ea754fa-cd31-481d-b6b7-6a6968b1ee0e
Horita, Z.
84a80017-cbaf-4713-8346-6f69ac7ea63e
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Lee, S.
5c554804-da3a-4842-a78a-94a77c0bbe6b
Utsunomiya, A.
c1e75ca6-9661-4efc-b10b-c8089677cb41
Akamatsu, H.
c5533033-c4cc-48c2-843c-00b98257f5f3
Neishi, K.
329e3a20-a14f-44e7-aef8-825a47da065e
Furukawa, M.
8ea754fa-cd31-481d-b6b7-6a6968b1ee0e
Horita, Z.
84a80017-cbaf-4713-8346-6f69ac7ea63e
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Lee, S., Utsunomiya, A., Akamatsu, H., Neishi, K., Furukawa, M., Horita, Z. and Langdon, T.G. (2002) Influence of scandium and zirconium on grain stability and superplastic ductilities in ultrafine-grained Al-Mg alloys. Acta Materialia, 50 (3), 553-564. (doi:10.1016/S1359-6454(01)00368-8).

Record type: Article

Abstract

Experiments were conducted to evaluate the grain refinement introduced by equal-channel angular pressing (ECAP) in three different Al–3% Mg alloys containing either 0.2% Sc, 0.2% Zr or a combination of 0.2% Sc and 0.12% Zr. The results show all three alloys exhibit significant grain refinement with as-pressed grain sizes in the range of ~0.2–0.3 µm. Tensile testing after ECAP revealed superplastic ductilities in the Al–Mg–Sc–Zr and Al–Mg–Sc alloys at strain rates in the vicinity of ~10-2 s-1 at temperatures of 573 and 673 K but superplasticity was not achieved in the Al–Mg–Zr alloy due to the onset of rapid grain growth at 573 K. At the higher temperature of 773 K, the Al–Mg–Sc–Zr alloy exhibited exceptional superplastic ductilities but superplasticity was no longer achieved in the Al–Mg–Sc alloy. This difference was due to extensive grain growth in the Al–Mg–Sc alloy at temperatures in the vicinity of 773 K whereas the ultrafine-grained microstructure in the Al–Mg–Sc–Zr alloy was stable at this high temperature due to the presence of stable Al3(ZrxSc1-x) precipitates.

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Published date: 2002
Keywords: aluminum alloys, equal-channel angular pressing, mechanical properties (high temperature)

Identifiers

Local EPrints ID: 23855
URI: http://eprints.soton.ac.uk/id/eprint/23855
ISSN: 1359-6454
PURE UUID: f3c0088b-2343-4ab5-ad3c-3bef370fbb6a
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 28 Mar 2006
Last modified: 30 Apr 2021 01:38

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Contributors

Author: S. Lee
Author: A. Utsunomiya
Author: H. Akamatsu
Author: K. Neishi
Author: M. Furukawa
Author: Z. Horita
Author: T.G. Langdon ORCID iD

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