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Primary recrystallization of a magnesium hybrid material fabricated by high-pressure torsion.

Mohamed, O. O., Bazarnik, P., Huang, Y., Azzeddine, H., Baudin, T., Brisset, F., Kawasaki, M. and Langdon, T. G., 2024. Primary recrystallization of a magnesium hybrid material fabricated by high-pressure torsion. Materials Today Communications, 38, 108305.

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Hiba_Hybrid SRX_revised.pdf - Accepted Version
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DOI: 10.1016/j.mtcomm.2024.108305


The static recrystallization and grain growth of a hybrid AZ31/Mg-0.6Gd (wt.%) material fabricated by high-pressure torsion (HPT) through 20 turns were explored after isochronal annealing at 150, 250, 350 and 450 °C for 1 h using electron backscatter diffraction, transmission electron microscopy and Vickers microhardness measurements. The results reveal heterogeneity in the grain size distributions of the AZ31 and Mg-0.6Gd regions after annealing at the lower temperatures of 150 and 250 °C leading to a clear AZ31/Mg-0.6Gd interfacial border. At the higher temperatures of 350 and 450 °C the AZ31/Mg-0.6Gd interfaces were not well-defined owing to the occurrence of grain growth. It is shown that grain growth is restricted in the AZ31 and Mg-0.6Gd regions due to the presence of stable nano-size Al8Mn5 particles and the precipitation of Mg17Al12 and Mg12Zn at 250 °C and of Mg5Gd and Mg12Gd phases at 350 and 450 °C. The distribution of the basal texture in both regions was strongly controlled by dynamic recrystallization, precipitation and grain growth. The values of the microhardness over the radial cross-sections of the hybrid discs decrease and become more uniform, in the range of ~35–66 Hv, with increasing annealing temperature.

Item Type:Article
Uncontrolled Keywords:High-pressure torsion; Hybrid metal; Magnesium; Precipitation; Recrystallization
Group:Faculty of Science & Technology
ID Code:39474
Deposited By: Symplectic RT2
Deposited On:08 Feb 2024 10:20
Last Modified:23 May 2024 13:26


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