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An investigation of the thermal stability of an MgDy alloy after processing by high-pressure torsion

An investigation of the thermal stability of an MgDy alloy after processing by high-pressure torsion
An investigation of the thermal stability of an MgDy alloy after processing by high-pressure torsion
An Mg-0.41Dy (wt%) alloy was successfully processed by high-pressure tension (HPT) through 5 turns at room temperature. The evolution of the recrystallization microstructure and the texture and mechanical properties of the deformed alloy were investigated after annealing at 200 and 400 °C for 1 h using Electron Backscatter Diffraction (EBSD) and Vickers measurements. The recrystallization temperature and activation energy were evaluated using Differential Scanning Calorimetry (DSC). Processing by HPT led to significant grain refinement with an average grain size of ~0.5 ± 0.1 μm which increased to ~1.2 ± 0.8 μm after annealing at 400 °C. This slow increase in grain size at a high temperature demonstrates a good thermal stability of the microstructure. The alloy exhibited two main fiber textures after HPT processing: firstly a typical basal fiber (φ1 = 0–360°, Φ = 0° and φ2 = 0–60°) and secondly a fiber localized at φ1 = 180°, Φ = 60° and φ2 = 0–90°. These textures were retained after annealing at 400 °C. There was no change in the microhardness value after annealing at 200 °C (41 ± 1 Hv) and only a minor decrease after annealing at 400 °C (38.4 ± 0.5 Hv). The DSC results showed that the temperature associated with the recrystallization process increased with increasing heating rate and the activation energy for recrystallization was measured as ~25 kJ mol−1.
1044-5803
519-529
Hanna, Abdelkader
ddb252e8-923c-429c-93e0-fd59742ddd0f
Azzeddine, Hiba
a9bb5955-be91-4ce8-971c-60ab5573a1a9
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Bradai, Djamel
59c22bbc-952f-4ab9-8619-8d63d6ee8a19
Cabrera, Jose Maria
551870a8-ae84-4812-b234-1e1b5d119f89
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Hanna, Abdelkader
ddb252e8-923c-429c-93e0-fd59742ddd0f
Azzeddine, Hiba
a9bb5955-be91-4ce8-971c-60ab5573a1a9
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Bradai, Djamel
59c22bbc-952f-4ab9-8619-8d63d6ee8a19
Cabrera, Jose Maria
551870a8-ae84-4812-b234-1e1b5d119f89
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Hanna, Abdelkader, Azzeddine, Hiba, Huang, Yi, Bradai, Djamel, Cabrera, Jose Maria and Langdon, Terence G (2019) An investigation of the thermal stability of an MgDy alloy after processing by high-pressure torsion. Materials Characterization, 151, 519-529. (doi:10.1016/j.matchar.2019.03.040).

Record type: Article

Abstract

An Mg-0.41Dy (wt%) alloy was successfully processed by high-pressure tension (HPT) through 5 turns at room temperature. The evolution of the recrystallization microstructure and the texture and mechanical properties of the deformed alloy were investigated after annealing at 200 and 400 °C for 1 h using Electron Backscatter Diffraction (EBSD) and Vickers measurements. The recrystallization temperature and activation energy were evaluated using Differential Scanning Calorimetry (DSC). Processing by HPT led to significant grain refinement with an average grain size of ~0.5 ± 0.1 μm which increased to ~1.2 ± 0.8 μm after annealing at 400 °C. This slow increase in grain size at a high temperature demonstrates a good thermal stability of the microstructure. The alloy exhibited two main fiber textures after HPT processing: firstly a typical basal fiber (φ1 = 0–360°, Φ = 0° and φ2 = 0–60°) and secondly a fiber localized at φ1 = 180°, Φ = 60° and φ2 = 0–90°. These textures were retained after annealing at 400 °C. There was no change in the microhardness value after annealing at 200 °C (41 ± 1 Hv) and only a minor decrease after annealing at 400 °C (38.4 ± 0.5 Hv). The DSC results showed that the temperature associated with the recrystallization process increased with increasing heating rate and the activation energy for recrystallization was measured as ~25 kJ mol−1.

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Hiba-MaterCharact 2019-accepted manuscript - Accepted Manuscript
Restricted to Repository staff only until 26 March 2020.
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More information

Accepted/In Press date: 26 March 2019
e-pub ahead of print date: 29 March 2019
Published date: 1 May 2019

Identifiers

Local EPrints ID: 429986
URI: https://eprints.soton.ac.uk/id/eprint/429986
ISSN: 1044-5803
PURE UUID: dba4fe61-e1f1-4e00-8a1e-661fe9714f72
ORCID for Yi Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for Terence G Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 09 Apr 2019 16:30
Last modified: 07 May 2019 00:34

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