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Evaluation of thermal stability and its effect on the corrosion behaviour of Mg-RE alloys processed by high-pressure torsion.

Azzeddine, H., Hanna, A., Dakhouche, A., Baudin, T., Brisset, F., Huang, Y. and Langdon, T. 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), 1-20.

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crystals-2320840 revised.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial.


DOI: 10.3390/cryst13040662


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 recrystallization (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 recrystallized 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.

Item Type:Article
Additional Information:Funded by ERC Advanced Grant: SPDMETALS. This article belongs to the Special Issue Crystal Plasticity (Volume III).
Uncontrolled Keywords:High-pressure torsion; Magnesium; Rare-earth alloys; Texture; Thermal stability
ID Code:38425
Deposited By: Symplectic RT2
Deposited On:13 Apr 2023 14:36
Last Modified:13 Apr 2023 14:36


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