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Grain refinement and superplastic flow in an aluminum alloy processed by high-pressure torsion

Grain refinement and superplastic flow in an aluminum alloy processed by high-pressure torsion
Grain refinement and superplastic flow in an aluminum alloy processed by high-pressure torsion
An aluminium-2024 alloy was prepared in the annealed and the solution treated conditions. Specimens in both conditions were processed by high-pressure torsion (HPT) at temperatures of either 293 or 673 K giving grain sizes for both conditions of ~0.15 and ~0.30 ?m for these two processing temperatures, respectively. Tensile testing was conducted at 673 K and superplastic elongations were achieved in both the annealed and the solution treated samples, with a maximum elongation of 570% for an annealed specimen processed by HPT at 293 K. To check on the significance of microstructural inhomogeneities across the HPT disks, samples were machined either from the center of the disks or from an off-center position. The experimental results show that higher elongations are achieved at the off-center position. The similarity between the annealed and the solution treated conditions after HPT is attributed to a dissolution of precipitates during HPT processing.
aluminum alloys, high-pressure torsion, severe plastic deformation, superplasticity, ultrafine grains
0921-5093
141-146
Dobatkin, Sergey V.
d3b1f98b-71ab-41fb-aace-d9491d22524c
Bastarache, Elena N.
825cc087-3d07-4cb3-ba9f-70168f185dda
Sakai, Genki
d8b77067-df2e-41e0-833f-34b4d3051a32
Fujita, Takeshi
f2d5a9fe-84e7-47c2-9e96-7ad57035c7e7
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Dobatkin, Sergey V.
d3b1f98b-71ab-41fb-aace-d9491d22524c
Bastarache, Elena N.
825cc087-3d07-4cb3-ba9f-70168f185dda
Sakai, Genki
d8b77067-df2e-41e0-833f-34b4d3051a32
Fujita, Takeshi
f2d5a9fe-84e7-47c2-9e96-7ad57035c7e7
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Dobatkin, Sergey V., Bastarache, Elena N., Sakai, Genki, Fujita, Takeshi, Horita, Zenji and Langdon, Terence G. (2005) Grain refinement and superplastic flow in an aluminum alloy processed by high-pressure torsion. Materials Science and Engineering: A, 408 (1-2), 141-146. (doi:10.1016/j.msea.2005.07.023).

Record type: Article

Abstract

An aluminium-2024 alloy was prepared in the annealed and the solution treated conditions. Specimens in both conditions were processed by high-pressure torsion (HPT) at temperatures of either 293 or 673 K giving grain sizes for both conditions of ~0.15 and ~0.30 ?m for these two processing temperatures, respectively. Tensile testing was conducted at 673 K and superplastic elongations were achieved in both the annealed and the solution treated samples, with a maximum elongation of 570% for an annealed specimen processed by HPT at 293 K. To check on the significance of microstructural inhomogeneities across the HPT disks, samples were machined either from the center of the disks or from an off-center position. The experimental results show that higher elongations are achieved at the off-center position. The similarity between the annealed and the solution treated conditions after HPT is attributed to a dissolution of precipitates during HPT processing.

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More information

Published date: 2005
Keywords: aluminum alloys, high-pressure torsion, severe plastic deformation, superplasticity, ultrafine grains
Organisations: Engineering Sciences

Identifiers

Local EPrints ID: 23815
URI: http://eprints.soton.ac.uk/id/eprint/23815
ISSN: 0921-5093
PURE UUID: b8bf7407-0cf4-465b-ac0a-d8ebc8471293
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 21 Mar 2006
Last modified: 10 Dec 2019 01:47

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Contributors

Author: Sergey V. Dobatkin
Author: Elena N. Bastarache
Author: Genki Sakai
Author: Takeshi Fujita
Author: Zenji Horita

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