Characterization of high pressure torsion processed 7150 Al-Zn-Mg-Cu alloy
Characterization of high pressure torsion processed 7150 Al-Zn-Mg-Cu alloy
Solution treated 7150 Al–Zn–Mg–Cu alloy samples were subjected to high pressure torsion (HPT) at room temperature and artificial ageing. Microhardness of HPT processed samples increases with distance from the centre, saturating near the edge of the disk. The hardness obtained through HPT processing is higher compared to that obtained by conventional solution treatment and artificially ageing of this high strength aluminium alloy. Differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) revealed the sequence of solid state reactions occurring in the Al–Zn–Mg–Cu system, and the presence of β' (Al3Zr), η' (MgZn2) and η (MgZn2) phases, respectively. TEM of HPT processed samples revealed that the grains near the edge of the disk are finer compared to that near the centre of the disk. Electrochemical polarisation studies of the HPT processed 7150 alloy indicated open circuit potential (OCP) and corrosion potential (Ecorr) values are more negative (i.e. anodic), and corrosion current density (icorr) values are about one order higher than the values of artificially aged tempers.
164-171
Ghosh, K.S.
c7737874-f0f7-4eac-947b-00e60ed8a7e0
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
30 August 2012
Ghosh, K.S.
c7737874-f0f7-4eac-947b-00e60ed8a7e0
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Ghosh, K.S., Gao, N. and Starink, M.J.
(2012)
Characterization of high pressure torsion processed 7150 Al-Zn-Mg-Cu alloy.
Materials Science and Engineering: A, 552, .
(doi:10.1016/j.msea.2012.05.026).
Abstract
Solution treated 7150 Al–Zn–Mg–Cu alloy samples were subjected to high pressure torsion (HPT) at room temperature and artificial ageing. Microhardness of HPT processed samples increases with distance from the centre, saturating near the edge of the disk. The hardness obtained through HPT processing is higher compared to that obtained by conventional solution treatment and artificially ageing of this high strength aluminium alloy. Differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) revealed the sequence of solid state reactions occurring in the Al–Zn–Mg–Cu system, and the presence of β' (Al3Zr), η' (MgZn2) and η (MgZn2) phases, respectively. TEM of HPT processed samples revealed that the grains near the edge of the disk are finer compared to that near the centre of the disk. Electrochemical polarisation studies of the HPT processed 7150 alloy indicated open circuit potential (OCP) and corrosion potential (Ecorr) values are more negative (i.e. anodic), and corrosion current density (icorr) values are about one order higher than the values of artificially aged tempers.
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Published date: 30 August 2012
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 347309
URI: http://eprints.soton.ac.uk/id/eprint/347309
ISSN: 0921-5093
PURE UUID: 3e4b158d-45ff-4161-80d2-c318c7c33b7f
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Date deposited: 28 Jan 2013 11:28
Last modified: 15 Mar 2024 03:10
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K.S. Ghosh
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