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Microstructural evolution during hot shear deformation of an extruded fine-grained Mg–Gd–Y–Zr alloy

Microstructural evolution during hot shear deformation of an extruded fine-grained Mg–Gd–Y–Zr alloy
Microstructural evolution during hot shear deformation of an extruded fine-grained Mg–Gd–Y–Zr alloy
Mg–Gd–Y–Zr alloys are among recently developed Mg alloys having superior mechanical properties at elevated temperatures. Dynamic recrystallization (DRX) and rare earth (RE)-rich particles play important roles in enhancing the high temperature strength of these alloys. Accordingly, the microstructural evolution of a fine grained extruded Mg–5Gd–4Y–0.4Zr alloy was investigated after hot shear deformation in the temperature range of 350–450 °C using the shear punch testing (SPT) method. The results reveal the occurrence of partial dynamic recrystallization at the grain boundaries at 350 °C while the fraction of DRX grains increases with increasing deformation temperature. A fully-recrystallized microstructure was achieved after SPT at 450 °C. The Gd-rich and Y-rich cuboid particles, having typical sizes in the range of ~50 nm to ~3 m, show excellent stability and compatibility after hot shear deformation and these particles enhance the high temperature strength during hot deformation at elevated temperatures. The textural evolution, examined using electron backscattered diffraction (EBSD), revealed a non-fibrous basal DRX texture after SPT which is different from the conventional deformation texture.
0022-2461
7843-7857
Alizadeh, R
c5795602-c8c6-4a32-a858-0a034f41b64d
Mahmudi, R
7081ef27-7be5-4f61-b388-c4cbd92a7276
Ngan, A.H.W
d9161786-a72d-4af4-a48b-8a385014d634
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Alizadeh, R
c5795602-c8c6-4a32-a858-0a034f41b64d
Mahmudi, R
7081ef27-7be5-4f61-b388-c4cbd92a7276
Ngan, A.H.W
d9161786-a72d-4af4-a48b-8a385014d634
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Alizadeh, R, Mahmudi, R, Ngan, A.H.W and Langdon, Terence G (2017) Microstructural evolution during hot shear deformation of an extruded fine-grained Mg–Gd–Y–Zr alloy Journal of Materials Science, 52, pp. 7843-7857.

Record type: Article

Abstract

Mg–Gd–Y–Zr alloys are among recently developed Mg alloys having superior mechanical properties at elevated temperatures. Dynamic recrystallization (DRX) and rare earth (RE)-rich particles play important roles in enhancing the high temperature strength of these alloys. Accordingly, the microstructural evolution of a fine grained extruded Mg–5Gd–4Y–0.4Zr alloy was investigated after hot shear deformation in the temperature range of 350–450 °C using the shear punch testing (SPT) method. The results reveal the occurrence of partial dynamic recrystallization at the grain boundaries at 350 °C while the fraction of DRX grains increases with increasing deformation temperature. A fully-recrystallized microstructure was achieved after SPT at 450 °C. The Gd-rich and Y-rich cuboid particles, having typical sizes in the range of ~50 nm to ~3 m, show excellent stability and compatibility after hot shear deformation and these particles enhance the high temperature strength during hot deformation at elevated temperatures. The textural evolution, examined using electron backscattered diffraction (EBSD), revealed a non-fibrous basal DRX texture after SPT which is different from the conventional deformation texture.

PDF REZA-JMS-accepted manuscript - Accepted Manuscript
Restricted to Repository staff only until 28 March 2018.

More information

Accepted/In Press date: 21 March 2017
e-pub ahead of print date: 29 March 2017
Published date: 1 July 2017
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 407431
URI: http://eprints.soton.ac.uk/id/eprint/407431
ISSN: 0022-2461
PURE UUID: 904f63af-1081-4e37-aa73-d45fcd85c928
ORCID for Terence G Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 07 Apr 2017 01:03
Last modified: 30 Sep 2017 21:42

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Contributors

Author: R Alizadeh
Author: R Mahmudi
Author: A.H.W Ngan

University divisions

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