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The sequence and kinetics of pre-precipitation in Mg-Nd alloys after HPT processing: a synchrotron and DSC study

The sequence and kinetics of pre-precipitation in Mg-Nd alloys after HPT processing: a synchrotron and DSC study
The sequence and kinetics of pre-precipitation in Mg-Nd alloys after HPT processing: a synchrotron and DSC study
The sequence and kinetics of pre-precipitation in an Mg-1.43Nd (wt.%) alloy was investigated after severe plastic deformation by high-pressure torsion (HPT) at room temperature using in situ synchrotron X-ray diffraction and differential scanning calorimetry (DSC). In situ aging at 250 °C up to 5 h led to precipitation of the β1-Mg3Nd and β-Mg12Nd phases but without any evidence for the metastable β‴ (undifferentiated β’’-DO19 and β′-Mg7Nd) or equilibrium βe-Mg41Nd5 phases. The β1-Mg3Nd and β-Mg12Nd phases appeared rapidly after HPT processing and their amounts were relatively large compared to the non-deformed sample. The Avrami time exponent of the β-Mg12Nd phase had a value near unity indicating a mechanism of nucleation after saturation and growth of the particles in 2 dimensions. DSC analysis revealed all metastable phases as well as the equilibrium phase. The activation energies associated with the pre-precipitation phases ranged between ∼126 and ∼235 kJ mol−1.
236-241
Bourezg, Yousf Islem
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Azzeddine, Hiba
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Hennet, Louis
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Thiaudière, Dominique
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Huang, Yi
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Bradai, Djamel
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Langdon, Terence G
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Bourezg, Yousf Islem
aab04bbc-d0f1-4ef4-8bef-2471dbbca4f0
Azzeddine, Hiba
9d0bbd8e-680c-48d1-b27a-fbdd23cd2228
Hennet, Louis
58dae329-b1de-494a-877e-6c626cc19252
Thiaudière, Dominique
cc8853a8-c94b-4101-aed1-b2bebc1957de
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, Hennet, Louis, Thiaudière, Dominique, Huang, Yi, Bradai, Djamel and Langdon, Terence G (2017) The sequence and kinetics of pre-precipitation in Mg-Nd alloys after HPT processing: a synchrotron and DSC study. Journal of Alloys and Compounds, 719, 236-241. (doi:10.1016/j.jallcom.2017.05.166).

Record type: Article

Abstract

The sequence and kinetics of pre-precipitation in an Mg-1.43Nd (wt.%) alloy was investigated after severe plastic deformation by high-pressure torsion (HPT) at room temperature using in situ synchrotron X-ray diffraction and differential scanning calorimetry (DSC). In situ aging at 250 °C up to 5 h led to precipitation of the β1-Mg3Nd and β-Mg12Nd phases but without any evidence for the metastable β‴ (undifferentiated β’’-DO19 and β′-Mg7Nd) or equilibrium βe-Mg41Nd5 phases. The β1-Mg3Nd and β-Mg12Nd phases appeared rapidly after HPT processing and their amounts were relatively large compared to the non-deformed sample. The Avrami time exponent of the β-Mg12Nd phase had a value near unity indicating a mechanism of nucleation after saturation and growth of the particles in 2 dimensions. DSC analysis revealed all metastable phases as well as the equilibrium phase. The activation energies associated with the pre-precipitation phases ranged between ∼126 and ∼235 kJ mol−1.

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Hiba_JACOM_accepted_manuscript - Accepted Manuscript
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Accepted/In Press date: 15 May 2017
e-pub ahead of print date: 18 May 2017
Published date: 30 September 2017
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 408402
URI: http://eprints.soton.ac.uk/id/eprint/408402
PURE UUID: c2a807e4-019a-47b3-8bc8-4060d94b404d
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

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Date deposited: 20 May 2017 04:02
Last modified: 17 Dec 2019 06:09

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Contributors

Author: Yousf Islem Bourezg
Author: Hiba Azzeddine
Author: Louis Hennet
Author: Dominique Thiaudière
Author: Yi Huang ORCID iD
Author: Djamel Bradai

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