An investigation by EXAFS of local atomic structure in an Mg-Nd alloy after processing by high-pressure torsion and ageing
An investigation by EXAFS of local atomic structure in an Mg-Nd alloy after processing by high-pressure torsion and ageing
The local atomic structure of an Mg-1.44Nd (wt.%) alloy was investigated after solution annealing, high-pressure torsion (HPT) processing up to 1 and 10 turns and ageing at 250 °C for 5 h using X-ray absorption fine structure (XAFS) measurements at the Nd LIII-edge. The results show that HPT processing has no effect on the atomic structure around Nd atoms compared to the unprocessed state, whereas ageing at 250 °C for 5 h induces a significant modification in the coordination number and interatomic distances around the Nd atoms. These variations are analyzed based on the correlations between precipitation, defects and atomic mobility of the chemical species.
Ageing, EXAFS, Metals and alloys, Mg-Nd alloy, Phase transformation, high-pressure torsion
Bourezg, Yousf Islem
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Azzeddine, Hiba
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Harfouche, Messaoud
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Thiaudière, Dominique
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Mocuta, Cristian
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Huang, Yi
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Bradai, Djamel
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Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
1 April 2020
Bourezg, Yousf Islem
aab04bbc-d0f1-4ef4-8bef-2471dbbca4f0
Azzeddine, Hiba
f32633f8-2f8a-433e-9180-ada2b8704eae
Harfouche, Messaoud
cbdc2723-728b-4dbc-866f-abb306c62c93
Thiaudière, Dominique
cc8853a8-c94b-4101-aed1-b2bebc1957de
Mocuta, Cristian
14b61f9a-1352-4019-9eb7-80de69a05506
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Bradai, Djamel
554ec639-52df-4169-8044-53485b61c829
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Bourezg, Yousf Islem, Azzeddine, Hiba, Harfouche, Messaoud, Thiaudière, Dominique, Mocuta, Cristian, Huang, Yi, Bradai, Djamel and Langdon, Terence G.
(2020)
An investigation by EXAFS of local atomic structure in an Mg-Nd alloy after processing by high-pressure torsion and ageing.
Materials Letters, 264, [127379].
(doi:10.1016/j.matlet.2020.127379).
Abstract
The local atomic structure of an Mg-1.44Nd (wt.%) alloy was investigated after solution annealing, high-pressure torsion (HPT) processing up to 1 and 10 turns and ageing at 250 °C for 5 h using X-ray absorption fine structure (XAFS) measurements at the Nd LIII-edge. The results show that HPT processing has no effect on the atomic structure around Nd atoms compared to the unprocessed state, whereas ageing at 250 °C for 5 h induces a significant modification in the coordination number and interatomic distances around the Nd atoms. These variations are analyzed based on the correlations between precipitation, defects and atomic mobility of the chemical species.
Text
Bourezg et al_revised
- Accepted Manuscript
More information
Accepted/In Press date: 17 January 2020
e-pub ahead of print date: 20 January 2020
Published date: 1 April 2020
Additional Information:
Funding Information:
Prof. D. Bradai wishes to deeply acknowledge the support of SOLEIL synchrotron, Gif-sur-Yvette Cedex, France, during the 20150973 proposal. Prof. T.G. Langdon and Dr. Yi Huang were supported by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS .
Publisher Copyright:
© 2020
Keywords:
Ageing, EXAFS, Metals and alloys, Mg-Nd alloy, Phase transformation, high-pressure torsion
Identifiers
Local EPrints ID: 437489
URI: http://eprints.soton.ac.uk/id/eprint/437489
ISSN: 0167-577X
PURE UUID: 99e5e6d2-996c-474a-bf0d-5ce9869decd9
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Date deposited: 31 Jan 2020 17:36
Last modified: 17 Mar 2024 05:15
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Contributors
Author:
Yousf Islem Bourezg
Author:
Hiba Azzeddine
Author:
Messaoud Harfouche
Author:
Dominique Thiaudière
Author:
Cristian Mocuta
Author:
Yi Huang
Author:
Djamel Bradai
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