Microstructure and microhardness of an Al-6061 metal matrix composite processed by high-pressure torsion
Microstructure and microhardness of an Al-6061 metal matrix composite processed by high-pressure torsion
Disks of an Al-6061 metal matrix composite, reinforced with 10 vol.% Al2O3 particles, were processed by high-pressure torsion (HPT) at room temperature for 1/4, 1/2, 1, 5 and 10 turns under an applied pressure of 6.0 GPa. The evolution of microstructure was investigated using optical microscopy and scanning electron microscopy. During HPT processing the average grain size within the aluminum matrix decreased from ? 35 ?m in the unprocessed condition to ? 170 nm after processing through 10 turns but there was no significant effect on the size and distribution of the alumina particulate clusters. The values of the Vickers microhardness were recorded across the surface of each disk and then plotted as two-dimensional and three-dimensional color-coded contour maps. The results show the hardness increases from ? 56 Hv in the initial condition to ? 165 Hv after HPT for 10 turns. The results demonstrate that, as in many unreinforced metallic alloys, the evolution of hardness with strain exhibits strain hardening without any significant recovery.
270-278
Alhajeri, Saleh N.
32728ba0-8d0d-4268-b58d-4e97f3bc54aa
Al-Fadhalah, Khaled J.
364d5aed-c107-4104-9be0-6bf0ae28d20b
Almazrouee, Abdulla I.
6aaff277-2dcc-4dbd-afd0-75620aa6b6a9
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
1 August 2016
Alhajeri, Saleh N.
32728ba0-8d0d-4268-b58d-4e97f3bc54aa
Al-Fadhalah, Khaled J.
364d5aed-c107-4104-9be0-6bf0ae28d20b
Almazrouee, Abdulla I.
6aaff277-2dcc-4dbd-afd0-75620aa6b6a9
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Alhajeri, Saleh N., Al-Fadhalah, Khaled J., Almazrouee, Abdulla I. and Langdon, Terence G.
(2016)
Microstructure and microhardness of an Al-6061 metal matrix composite processed by high-pressure torsion.
Materials Characterization, 118, .
(doi:10.1016/j.matchar.2016.06.003).
Abstract
Disks of an Al-6061 metal matrix composite, reinforced with 10 vol.% Al2O3 particles, were processed by high-pressure torsion (HPT) at room temperature for 1/4, 1/2, 1, 5 and 10 turns under an applied pressure of 6.0 GPa. The evolution of microstructure was investigated using optical microscopy and scanning electron microscopy. During HPT processing the average grain size within the aluminum matrix decreased from ? 35 ?m in the unprocessed condition to ? 170 nm after processing through 10 turns but there was no significant effect on the size and distribution of the alumina particulate clusters. The values of the Vickers microhardness were recorded across the surface of each disk and then plotted as two-dimensional and three-dimensional color-coded contour maps. The results show the hardness increases from ? 56 Hv in the initial condition to ? 165 Hv after HPT for 10 turns. The results demonstrate that, as in many unreinforced metallic alloys, the evolution of hardness with strain exhibits strain hardening without any significant recovery.
Text
Saleh-MC-accepted manuscript.pdf
- Accepted Manuscript
More information
Accepted/In Press date: 3 June 2016
e-pub ahead of print date: 4 June 2016
Published date: 1 August 2016
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 396895
URI: http://eprints.soton.ac.uk/id/eprint/396895
ISSN: 1044-5803
PURE UUID: 789dabe4-8aec-4b76-8716-27714273d517
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Date deposited: 16 Jun 2016 08:25
Last modified: 15 Mar 2024 05:40
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Contributors
Author:
Saleh N. Alhajeri
Author:
Khaled J. Al-Fadhalah
Author:
Abdulla I. Almazrouee
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