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

Evaluating the textural and mechanical properties of an Mg-Dy alloy processed by high-pressure torsion
Evaluating the textural and mechanical properties of an Mg-Dy alloy processed by high-pressure torsion
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.
0925-8388
61-71
Hanna, Abdelkader
ddb252e8-923c-429c-93e0-fd59742ddd0f
Azzeddine, Hiba
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Lachhab, Rabeb
83a5097e-d1f8-41dd-a969-eb388916d3f3
Baudin, Thierry
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Helbert, Anne-Laure
0fe1fd69-b89f-4b5c-a14a-71cd7cf63f10
Brisset, François
c93ca177-5b75-400d-a9fb-85a567cebec6
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Bradai, Djamel
59c22bbc-952f-4ab9-8619-8d63d6ee8a19
Hanna, Abdelkader
ddb252e8-923c-429c-93e0-fd59742ddd0f
Azzeddine, Hiba
f32633f8-2f8a-433e-9180-ada2b8704eae
Lachhab, Rabeb
83a5097e-d1f8-41dd-a969-eb388916d3f3
Baudin, Thierry
933b263a-4a22-4c65-9599-16b27346e946
Helbert, Anne-Laure
0fe1fd69-b89f-4b5c-a14a-71cd7cf63f10
Brisset, François
c93ca177-5b75-400d-a9fb-85a567cebec6
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Bradai, Djamel
59c22bbc-952f-4ab9-8619-8d63d6ee8a19

Hanna, Abdelkader, Azzeddine, Hiba, Lachhab, Rabeb, Baudin, Thierry, Helbert, Anne-Laure, Brisset, François, Huang, Yi, Langdon, Terence G. and Bradai, Djamel (2019) Evaluating the textural and mechanical properties of an Mg-Dy alloy processed by high-pressure torsion. Journal of Alloys and Compounds, 778, 61-71. (doi:10.1016/j.jallcom.2018.11.109).

Record type: Article

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.

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Hiba JACOM accepted manuscript - Accepted Manuscript
Restricted to Repository staff only until 11 November 2019.
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Accepted/In Press date: 8 November 2018
e-pub ahead of print date: 12 November 2018
Published date: 25 March 2019

Identifiers

Local EPrints ID: 426227
URI: https://eprints.soton.ac.uk/id/eprint/426227
ISSN: 0925-8388
PURE UUID: bc159dd6-19c3-434f-a191-f5cfec12f6fc
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: 20 Nov 2018 17:30
Last modified: 15 Aug 2019 00:47

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Contributors

Author: Abdelkader Hanna
Author: Hiba Azzeddine
Author: Rabeb Lachhab
Author: Thierry Baudin
Author: Anne-Laure Helbert
Author: François Brisset
Author: Yi Huang ORCID iD
Author: Djamel Bradai

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