The University of Southampton
University of Southampton Institutional Repository

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
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
0921-5093
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
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, 786-794. (doi:10.1016/j.msea.2015.10.094).

Record type: Article

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

Text
Reza-MSEA-accepted manuscript.pdf - Other
Download (1MB)

More information

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: https://eprints.soton.ac.uk/id/eprint/383510
ISSN: 0921-5093
PURE UUID: b90d65a2-44e6-4d4e-b7b0-92bd2f36ccea
ORCID for Y. Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 13 Nov 2015 16:28
Last modified: 15 Aug 2019 00:47

Export record

Altmetrics

Contributors

Author: R. Alizadeh
Author: R. Mahmudi
Author: A.H.W. Ngan
Author: Y. Huang ORCID iD
Author: T.G. Langdon ORCID iD

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×