Evaluation of thermal stability and its effect on the corrosion behaviour of Mg-RE alloys processed by high-pressure torsion
Evaluation of thermal stability and its effect on the corrosion behaviour of Mg-RE alloys processed by high-pressure torsion
The evolutions of microstructure and texture and the corrosion behaviour of low light rare-earth containing Mg-1.4Nd and low heavy rare-earth containing Mg-0.6Gd and Mg-0.4Dy (wt.%) were evaluated and compared after processing by high-pressure torsion (HPT) and isochronal annealing at 250 and 450 °C for 1 h using electron backscatter diffraction (EBSD) and electrochemical tests in a 3.5% (wt.%) NaCl solution. The EBSD results show that dynamic recrystallisation (DRX) was restricted in the Mg-1.4Nd alloy which led to a heterogenous deformation microstructure whereas the Mg-0.6Gd and Mg-0.4Dy alloys exhibited a homogenous deformation microstructure formed mostly of equiaxed dynamically recrystallised DRX grains. The HPT processing caused the development of a deviated basal texture in the three alloys. A good thermal stability of the three alloys was noticed after annealing at 250 °C. By contrast, annealing at 450 °C led to a homogenous equiaxed microstructure and weakening of texture for the Mg-1.4Nd alloy and a heterogenous bimodal microstructure with a stable basal texture for the Mg-0.6Gd and Mg-0.4Dy alloys. The HPT-processed Mg–RE alloys exhibited an improved corrosion resistance due to grain refinement. Thereafter, the corrosion resistance of the Mg-0.6Gd and Mg-0.4Dy alloys decreased with increasing annealing temperature due to an increase in grain size while the corrosion resistance of the Mg-1.4Nd alloy was improved after annealing at 450 °C due to precipitation and texture weakening.
High-pressure torsion, Magnesium, Rare-earth alloys, Texture, Thermal stability, rare-earth alloys, high-pressure torsion, texture, magnesium, thermal stability
Azzeddine, Hiba
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Hanna, Abdelkader
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Dakhouche, Achour
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Baudin, Thierry
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Brisset, François
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Huang, Yi
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Langdon, Terence G.
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April 2023
Azzeddine, Hiba
a9bb5955-be91-4ce8-971c-60ab5573a1a9
Hanna, Abdelkader
ddb252e8-923c-429c-93e0-fd59742ddd0f
Dakhouche, Achour
839036d4-0883-420a-87b3-d07501c188b0
Baudin, Thierry
448e215d-c156-4c0a-9a3a-04078a7174b8
Brisset, François
c93ca177-5b75-400d-a9fb-85a567cebec6
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Azzeddine, Hiba, Hanna, Abdelkader, Dakhouche, Achour, Baudin, Thierry, Brisset, François, Huang, Yi and Langdon, Terence G.
(2023)
Evaluation of thermal stability and its effect on the corrosion behaviour of Mg-RE alloys processed by high-pressure torsion.
Crystals, 13 (4), [662].
(doi:10.3390/cryst13040662).
Abstract
The evolutions of microstructure and texture and the corrosion behaviour of low light rare-earth containing Mg-1.4Nd and low heavy rare-earth containing Mg-0.6Gd and Mg-0.4Dy (wt.%) were evaluated and compared after processing by high-pressure torsion (HPT) and isochronal annealing at 250 and 450 °C for 1 h using electron backscatter diffraction (EBSD) and electrochemical tests in a 3.5% (wt.%) NaCl solution. The EBSD results show that dynamic recrystallisation (DRX) was restricted in the Mg-1.4Nd alloy which led to a heterogenous deformation microstructure whereas the Mg-0.6Gd and Mg-0.4Dy alloys exhibited a homogenous deformation microstructure formed mostly of equiaxed dynamically recrystallised DRX grains. The HPT processing caused the development of a deviated basal texture in the three alloys. A good thermal stability of the three alloys was noticed after annealing at 250 °C. By contrast, annealing at 450 °C led to a homogenous equiaxed microstructure and weakening of texture for the Mg-1.4Nd alloy and a heterogenous bimodal microstructure with a stable basal texture for the Mg-0.6Gd and Mg-0.4Dy alloys. The HPT-processed Mg–RE alloys exhibited an improved corrosion resistance due to grain refinement. Thereafter, the corrosion resistance of the Mg-0.6Gd and Mg-0.4Dy alloys decreased with increasing annealing temperature due to an increase in grain size while the corrosion resistance of the Mg-1.4Nd alloy was improved after annealing at 450 °C due to precipitation and texture weakening.
Text
crystals-2320840 revised
- Accepted Manuscript
Text
crystals-13-00662-v3
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More information
Accepted/In Press date: 9 April 2023
e-pub ahead of print date: 11 April 2023
Published date: April 2023
Additional Information:
Funding Information:
The authors gratefully acknowledge Talal Al-Samman from The Institute for Physical Metallurgy and Materials Physics, RWTH Aachen University, Germany, for supplying the Mg–RE alloys. The work of two of the authors was supported by the European Research Council under Grant Agreement No. 267464-SPDMETALS (YH and TGL).
Publisher Copyright:
© 2023 by the authors.
Keywords:
High-pressure torsion, Magnesium, Rare-earth alloys, Texture, Thermal stability, rare-earth alloys, high-pressure torsion, texture, magnesium, thermal stability
Identifiers
Local EPrints ID: 484622
URI: http://eprints.soton.ac.uk/id/eprint/484622
ISSN: 2073-4352
PURE UUID: 032aad2f-0111-41b1-acf0-841b69325a62
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Date deposited: 17 Nov 2023 18:08
Last modified: 17 Mar 2024 03:25
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Author:
Hiba Azzeddine
Author:
Abdelkader Hanna
Author:
Achour Dakhouche
Author:
Thierry Baudin
Author:
François Brisset
Author:
Yi Huang
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