Evaluating the textural and mechanical properties of an Mg-Dy alloy processed by high-pressure torsion.

Hanna, A., Azzeddine, H., Lachhab, R., Baudin, T., Helbert, A-L., Brisset, F., Huang, Y., Bradai, D. and Langdon, T.G., 2019. Evaluating the textural and mechanical properties of an Mg-Dy alloy processed by high-pressure torsion. Journal of alloys and compounds, 778 (March), pp. 61-71.

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DOI: 10.1016/j.jallcom.2018.11.109

Abstract

Samples of an Mg-0.41Dy (wt. %) alloy were severely deformed by high-pressure torsion (HPT) at room temperature up to 15 turns and the texture, microstructure and microhardness values in the centres, mid-radial points and edges of the HPT-deformed discs were investigated using X-ray diffraction, Electron BackScatter Diffraction and Vickers microhardness measurements. The textures in the centres of discs were characterized by a typical weak basal fiber whereas at both the mid-points and edges of the discs there was a strong basal texture where the c-axis of most grains was shifted 15° away from the shear direction. An almost homogeneous ultrafine-grained structure with a grain size of about 0.75 μm was achieved after 15 HPT turns. The microhardness values in these three positions increased with increasing numbers of turns, reached a maximum and then decreased to a lower steady-state level at large strains. In addition to dislocation and grain size hardening, the results show that texture strengthening contributes significantly to the rapid increase in hardening in the early stages of deformation.

Item Type:Article
ISSN:0925-8388
Uncontrolled Keywords:Hardening; High-pressure torsion; Mg-Dy alloy; Microhardness; Texture
Group:Faculty of Science & Technology
ID Code:31462
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:03 Dec 2018 16:53
Last Modified:03 Dec 2018 16:53

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