Influence of initial heat treatment on the microhardness evolution of an Al-Mg-Sc alloy processed by high-pressure torsion
Influence of initial heat treatment on the microhardness evolution of an Al-Mg-Sc alloy processed by high-pressure torsion
An Al-3% Mg-0.2% Sc alloy was subjected to annealing or solution treatment and further processed by HPT at room temperature. Microhardness measurements were taken along the middle-sections of the discs and they demonstrated that a very substantial hardening is achieved during HPT processing regardless of the initial heat treatment. Hardness values of ~200 Hv were recorded at the edge of the samples although the microhardness distribution remained inhomogeneous along the diameters of the discs after 20 turns of high-pressure torsion. In addition, the microhardness of the solution treated Al-Mg-Sc samples continued to increase with the equivalent strain imposed by the anvils even after 30 turns of HPT processing whereas the hardness at the edges of the annealed discs saturated after 10 turns. These differences in the hardness evolution are attributed to the higher Mg content in solid solution in the case of the solution treated samples and its influence on delaying the recovery rate of this aluminium alloy.
1471-1476
Pereira, Pedro Henrique R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
January 2017
Pereira, Pedro Henrique R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Pereira, Pedro Henrique R., Huang, Yi and Langdon, Terence G.
(2017)
Influence of initial heat treatment on the microhardness evolution of an Al-Mg-Sc alloy processed by high-pressure torsion.
Materials Science Forum, 879, .
(doi:10.4028/www.scientific.net/MSF.879.1471).
Abstract
An Al-3% Mg-0.2% Sc alloy was subjected to annealing or solution treatment and further processed by HPT at room temperature. Microhardness measurements were taken along the middle-sections of the discs and they demonstrated that a very substantial hardening is achieved during HPT processing regardless of the initial heat treatment. Hardness values of ~200 Hv were recorded at the edge of the samples although the microhardness distribution remained inhomogeneous along the diameters of the discs after 20 turns of high-pressure torsion. In addition, the microhardness of the solution treated Al-Mg-Sc samples continued to increase with the equivalent strain imposed by the anvils even after 30 turns of HPT processing whereas the hardness at the edges of the annealed discs saturated after 10 turns. These differences in the hardness evolution are attributed to the higher Mg content in solid solution in the case of the solution treated samples and its influence on delaying the recovery rate of this aluminium alloy.
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Accepted/In Press date: 23 September 2015
e-pub ahead of print date: 15 November 2016
Published date: January 2017
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 402930
URI: http://eprints.soton.ac.uk/id/eprint/402930
ISSN: 1662-9752
PURE UUID: e2d18316-88ec-4d7a-b87c-dcc3077907c3
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Date deposited: 18 Nov 2016 14:50
Last modified: 16 Mar 2024 03:28
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Author:
Pedro Henrique R. Pereira
Author:
Yi Huang
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