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Development of an Al 7050-10 vol.% alumina nanocomposite through cold consolidation of particles by high-pressure torsion

Development of an Al 7050-10 vol.% alumina nanocomposite through cold consolidation of particles by high-pressure torsion
Development of an Al 7050-10 vol.% alumina nanocomposite through cold consolidation of particles by high-pressure torsion
An Al 7050-10 vol.% Al2O3 nanocomposite was produced by cold consolidation of Al 7050 gas-atomized powder with alumina particles by means of severe plastic deformation using highpressure torsion (HPT). The processing was conducted at room temperature under a pressure of 6.0 GPa, for 50 revolutions with a rotation speed of 2 rpm. The purpose of this work was to consolidate at room temperature one high strength Al alloy with Al2O3 particles without any prior or post sintering. In order to characterize the product, the disk microstructure was examined after consolidation using scanning and transmission electron microscopy and X-ray diffraction was used to determine the presence of different phases. Energy-dispersive X-ray spectroscopy (EDS) was undertaken to provide chemical analysis of the phases and hardness
tests were performed to check the strength. The results show that the alumina particles in the periphery of the disk are more finely dispersed than in the central regions. The average grain size of the Al 7050 matrix ranged from ~50 to ~200 nm and the hardness measurements varied from ~237 Hv to ~307 Hv with disk edges having higher hardness values than in the central area.
aluminum alloy, consolidation, high-pressure torsion, nanocomposite, severe plastic deformation
2238-7854
12626-12633
Milhorato, Fabio
70a9de7b-6fc0-49e2-b89f-0b74c2486c4a
Figueiredo, Roberto
184313b8-9f00-451a-bfb1-6d80a2c89b78
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Mazzer, Eric M.
e22d681e-711d-429f-8fcf-765af6f84c72
Milhorato, Fabio
70a9de7b-6fc0-49e2-b89f-0b74c2486c4a
Figueiredo, Roberto
184313b8-9f00-451a-bfb1-6d80a2c89b78
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Mazzer, Eric M.
e22d681e-711d-429f-8fcf-765af6f84c72

Milhorato, Fabio, Figueiredo, Roberto, Langdon, Terence G and Mazzer, Eric M. (2020) Development of an Al 7050-10 vol.% alumina nanocomposite through cold consolidation of particles by high-pressure torsion. Journal of Materials Research and Technology, 9 (6), 12626-12633. (doi:10.1016/j.jmrt.2020.09.014).

Record type: Article

Abstract

An Al 7050-10 vol.% Al2O3 nanocomposite was produced by cold consolidation of Al 7050 gas-atomized powder with alumina particles by means of severe plastic deformation using highpressure torsion (HPT). The processing was conducted at room temperature under a pressure of 6.0 GPa, for 50 revolutions with a rotation speed of 2 rpm. The purpose of this work was to consolidate at room temperature one high strength Al alloy with Al2O3 particles without any prior or post sintering. In order to characterize the product, the disk microstructure was examined after consolidation using scanning and transmission electron microscopy and X-ray diffraction was used to determine the presence of different phases. Energy-dispersive X-ray spectroscopy (EDS) was undertaken to provide chemical analysis of the phases and hardness
tests were performed to check the strength. The results show that the alumina particles in the periphery of the disk are more finely dispersed than in the central regions. The average grain size of the Al 7050 matrix ranged from ~50 to ~200 nm and the hardness measurements varied from ~237 Hv to ~307 Hv with disk edges having higher hardness values than in the central area.

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RBF-JMRT-final-11Sept2020
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More information

Accepted/In Press date: 2 September 2020
e-pub ahead of print date: 20 September 2020
Published date: November 2020
Keywords: aluminum alloy, consolidation, high-pressure torsion, nanocomposite, severe plastic deformation

Identifiers

Local EPrints ID: 447716
URI: http://eprints.soton.ac.uk/id/eprint/447716
ISSN: 2238-7854
PURE UUID: 231fe88a-ec19-4e8c-831b-b6364c3a2458
ORCID for Terence G Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 18 Mar 2021 17:53
Last modified: 26 Nov 2021 06:17

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Contributors

Author: Fabio Milhorato
Author: Roberto Figueiredo
Author: Eric M. Mazzer

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