Superplasticity of a nano-grained Mg-Gd-Y-Zr alloy processed by high-pressure torsion
Superplasticity of a nano-grained Mg-Gd-Y-Zr alloy processed by high-pressure torsion
While most of the reports on Mg-Gd-Y-Zr alloys report superplasticity after extrusion or friction stir processing, it is important to investigate superplasticity in these alloys after other severe plastic deformation processes having greater grain refinement capability. Accordingly, superplasticity was studied in an Mg–9Gd–4Y–0.4Zr (GW94) alloy after different high-pressure torsion (HPT) conditions. The HPT was performed at room temperature under an applied pressure of 6.0 GPa for up to 16 turns. TEM microstructural characterization revealed that the grain size was reduced from an initial value of ?8.6 ?m in the extruded condition to ?95±10 and ?85±10 nm after 8 and 16 turns, respectively. A shear punch testing method was used for evaluation of superplasticity at 573, 623, 673 and 723 K. Maximum strain rate sensitivities of ?0.51±0.05 and ?0.48±0.05 were obtained at 623 K for the material processed through 16 and 8 turns, respectively. This strain rate sensitivity and an activation energy of ?100±5 kJ mol–1 suggests the occurrence of grain boundary sliding in the superplastic region
high-pressure torsion, Mg–Gd–Y–Zr alloys, nano-grained metals, shear punch testing, superplasticity
786-794
Alizadeh, R.
8452d2d2-68c1-4a95-840f-8e19855799af
Mahmudi, R.
1e661235-7596-4004-9ace-4c81e6fe9b21
Ngan, A.H.W.
44dfeaba-996b-4379-b2d0-fae94af5bd8f
Huang, Y.
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
10 January 2016
Alizadeh, R.
8452d2d2-68c1-4a95-840f-8e19855799af
Mahmudi, R.
1e661235-7596-4004-9ace-4c81e6fe9b21
Ngan, A.H.W.
44dfeaba-996b-4379-b2d0-fae94af5bd8f
Huang, Y.
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Alizadeh, R., Mahmudi, R., Ngan, A.H.W., Huang, Y. and Langdon, T.G.
(2016)
Superplasticity of a nano-grained Mg-Gd-Y-Zr alloy processed by high-pressure torsion.
Materials Science and Engineering: A, 651, .
(doi:10.1016/j.msea.2015.10.094).
Abstract
While most of the reports on Mg-Gd-Y-Zr alloys report superplasticity after extrusion or friction stir processing, it is important to investigate superplasticity in these alloys after other severe plastic deformation processes having greater grain refinement capability. Accordingly, superplasticity was studied in an Mg–9Gd–4Y–0.4Zr (GW94) alloy after different high-pressure torsion (HPT) conditions. The HPT was performed at room temperature under an applied pressure of 6.0 GPa for up to 16 turns. TEM microstructural characterization revealed that the grain size was reduced from an initial value of ?8.6 ?m in the extruded condition to ?95±10 and ?85±10 nm after 8 and 16 turns, respectively. A shear punch testing method was used for evaluation of superplasticity at 573, 623, 673 and 723 K. Maximum strain rate sensitivities of ?0.51±0.05 and ?0.48±0.05 were obtained at 623 K for the material processed through 16 and 8 turns, respectively. This strain rate sensitivity and an activation energy of ?100±5 kJ mol–1 suggests the occurrence of grain boundary sliding in the superplastic region
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Reza-MSEA-accepted manuscript.pdf
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Accepted/In Press date: 24 October 2015
e-pub ahead of print date: 29 October 2015
Published date: 10 January 2016
Keywords:
high-pressure torsion, Mg–Gd–Y–Zr alloys, nano-grained metals, shear punch testing, superplasticity
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 383510
URI: http://eprints.soton.ac.uk/id/eprint/383510
ISSN: 0921-5093
PURE UUID: b90d65a2-44e6-4d4e-b7b0-92bd2f36ccea
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Date deposited: 13 Nov 2015 16:28
Last modified: 15 Mar 2024 03:39
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Author:
R. Alizadeh
Author:
R. Mahmudi
Author:
A.H.W. Ngan
Author:
Y. Huang
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