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Microstructure, texture and superplasticity of a fine-grained Mg-Gd-Zr alloy processed by equal-channel angular pressing

Microstructure, texture and superplasticity of a fine-grained Mg-Gd-Zr alloy processed by equal-channel angular pressing
Microstructure, texture and superplasticity of a fine-grained Mg-Gd-Zr alloy processed by equal-channel angular pressing
There are limited reports to date on the microstructure and superplasticity of the Mg-Gd alloys after processing by equal-channel angular pressing (ECAP). Accordingly, the effects of ECAP temperature from 473 K to 723 K (200 °C to 450 °C) and number of passes (2, 4, and 8) on the microstructure and texture of an extruded Mg-5Gd-0.4Zr (GW50) alloy were investigated by scanning electron microscope, transmission electron microscope, and electron backscattered diffraction. The results show that the optimum ECAP temperature is 623 K (350 °C). Higher temperatures give extensive grain growth and the material has insufficient formability at lower temperatures. The results show also that the alloy exhibits no further grain refinement after four ECAP passes and there is slight grain growth at 8 ECAP passes. Samples were processed by four passes at 623 K (350 °C) and then subjected to shear punch testing. The results confirm the occurrence of superplastic behavior at 723 K (450 °C) with a maximum strain rate sensitivity index of ~0.47 and an activation energy of ~110 kJ mol-1. The results are consistent with the occurrence of flow by grain boundary sliding in the superplastic region.
1073-5623
6056-6069
Alizadeh, R.
8452d2d2-68c1-4a95-840f-8e19855799af
Mahmudi, R.
1e661235-7596-4004-9ace-4c81e6fe9b21
Ngan, A.H.W.
44dfeaba-996b-4379-b2d0-fae94af5bd8f
Pereira, P.H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
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
Pereira, P.H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Huang, Y.
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Alizadeh, R., Mahmudi, R., Ngan, A.H.W., Pereira, P.H.R., Huang, Y. and Langdon, T.G. (2016) Microstructure, texture and superplasticity of a fine-grained Mg-Gd-Zr alloy processed by equal-channel angular pressing. Metallurgical and Materials Transactions A, 47, 6056-6069. (doi:10.1007/s11661-016-3765-3).

Record type: Article

Abstract

There are limited reports to date on the microstructure and superplasticity of the Mg-Gd alloys after processing by equal-channel angular pressing (ECAP). Accordingly, the effects of ECAP temperature from 473 K to 723 K (200 °C to 450 °C) and number of passes (2, 4, and 8) on the microstructure and texture of an extruded Mg-5Gd-0.4Zr (GW50) alloy were investigated by scanning electron microscope, transmission electron microscope, and electron backscattered diffraction. The results show that the optimum ECAP temperature is 623 K (350 °C). Higher temperatures give extensive grain growth and the material has insufficient formability at lower temperatures. The results show also that the alloy exhibits no further grain refinement after four ECAP passes and there is slight grain growth at 8 ECAP passes. Samples were processed by four passes at 623 K (350 °C) and then subjected to shear punch testing. The results confirm the occurrence of superplastic behavior at 723 K (450 °C) with a maximum strain rate sensitivity index of ~0.47 and an activation energy of ~110 kJ mol-1. The results are consistent with the occurrence of flow by grain boundary sliding in the superplastic region.

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Reza-ECAP-MMT accepted manuscript.pdf - Accepted Manuscript
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More information

Accepted/In Press date: 27 August 2016
e-pub ahead of print date: 19 September 2016
Published date: 1 December 2016
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 398415
URI: https://eprints.soton.ac.uk/id/eprint/398415
ISSN: 1073-5623
PURE UUID: c45d8b44-dd55-4640-9bbf-0c04988b1cbb
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: 21 Sep 2016 08:09
Last modified: 15 Aug 2019 05:24

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