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Thermal stability of an Mg-Nd alloy processed by high-pressure torsion

Thermal stability of an Mg-Nd alloy processed by high-pressure torsion
Thermal stability of an Mg-Nd alloy processed by high-pressure torsion
The evolution of microstructure, texture, and mechanical properties of an Mg–1.43Nd (wt%) alloy is investigated after processing by high‐pressure torsion at room temperature through five turns and isochronal annealing for 1 h at 150, 250, 350, and 450 °C using electron backscatter diffraction and Vickers microhardness. The alloy exhibits a good thermal stability up to annealing at 250 °C, with mean grain size of ≈0.65 μm. The microhardness shows an initial hardening after annealing at 150 °C and then a subsequent softening. The deformation texture, a basal texture shifted 60° away from the shear direction (SD), is retained during annealing up to 250 °C. In contrast, a basal texture with symmetrical splitting toward SD is developed after annealing at 350 °C. The precipitation sequence and their pinning effects are responsible for the age‐hardening, stabilization of grain size, and the texture modification. The kinetics of grain growth in the Mg–1.43Nd alloy follows two stages depending on the temperature annealing range, with an activation energy of ≈26 kJ mol−1 in the low temperature range of 150–250 °C and ≈147 kJ mol−1 in the high temperature range of 250–450 °C.
high-pressure torsion,, Mg-RE alloy,, microstructure, recrystallization,, texture
1438-1656
Tighiouaret, Samia
1fa2ab4b-a338-48f0-8cff-6ec1f199000b
Lachhab, Rabeb
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Hanna, Abdelkader
ddb252e8-923c-429c-93e0-fd59742ddd0f
Azzeddine, Hiba
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Huang, Yi
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Baudin, Thierry
933b263a-4a22-4c65-9599-16b27346e946
Helbert, Anne-Laure
0fe1fd69-b89f-4b5c-a14a-71cd7cf63f10
Brisset, Francois
b9f69e75-4055-44be-8b62-497b12873d51
Bradai, Djamel
59c22bbc-952f-4ab9-8619-8d63d6ee8a19
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Tighiouaret, Samia
1fa2ab4b-a338-48f0-8cff-6ec1f199000b
Lachhab, Rabeb
83a5097e-d1f8-41dd-a969-eb388916d3f3
Hanna, Abdelkader
ddb252e8-923c-429c-93e0-fd59742ddd0f
Azzeddine, Hiba
f32633f8-2f8a-433e-9180-ada2b8704eae
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Baudin, Thierry
933b263a-4a22-4c65-9599-16b27346e946
Helbert, Anne-Laure
0fe1fd69-b89f-4b5c-a14a-71cd7cf63f10
Brisset, Francois
b9f69e75-4055-44be-8b62-497b12873d51
Bradai, Djamel
59c22bbc-952f-4ab9-8619-8d63d6ee8a19
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Tighiouaret, Samia, Lachhab, Rabeb, Hanna, Abdelkader, Azzeddine, Hiba, Huang, Yi, Baudin, Thierry, Helbert, Anne-Laure, Brisset, Francois, Bradai, Djamel and Langdon, Terence G (2019) Thermal stability of an Mg-Nd alloy processed by high-pressure torsion. Advanced Engineering Materials. (doi:10.1002/adem.201900801).

Record type: Article

Abstract

The evolution of microstructure, texture, and mechanical properties of an Mg–1.43Nd (wt%) alloy is investigated after processing by high‐pressure torsion at room temperature through five turns and isochronal annealing for 1 h at 150, 250, 350, and 450 °C using electron backscatter diffraction and Vickers microhardness. The alloy exhibits a good thermal stability up to annealing at 250 °C, with mean grain size of ≈0.65 μm. The microhardness shows an initial hardening after annealing at 150 °C and then a subsequent softening. The deformation texture, a basal texture shifted 60° away from the shear direction (SD), is retained during annealing up to 250 °C. In contrast, a basal texture with symmetrical splitting toward SD is developed after annealing at 350 °C. The precipitation sequence and their pinning effects are responsible for the age‐hardening, stabilization of grain size, and the texture modification. The kinetics of grain growth in the Mg–1.43Nd alloy follows two stages depending on the temperature annealing range, with an activation energy of ≈26 kJ mol−1 in the low temperature range of 150–250 °C and ≈147 kJ mol−1 in the high temperature range of 250–450 °C.

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Tighiouaret-AEM 2019-Accepted manuscript - Accepted Manuscript
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Accepted/In Press date: 27 August 2019
Published date: 9 September 2019
Keywords: high-pressure torsion,, Mg-RE alloy,, microstructure, recrystallization,, texture

Identifiers

Local EPrints ID: 435737
URI: http://eprints.soton.ac.uk/id/eprint/435737
ISSN: 1438-1656
PURE UUID: c0fdb83d-b91e-4db2-ab3e-b41482e4cab5
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: 19 Nov 2019 17:30
Last modified: 17 Mar 2024 05:01

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Contributors

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

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