DSC analysis of dissolution reaction in an as-cast and HPT-processed Mg-Gd alloy
DSC analysis of dissolution reaction in an as-cast and HPT-processed Mg-Gd alloy
The dissolution reaction kinetics were determined by differential scanning calorimetry (DSC) analysis for Mg-0.6Gd (wt.%) in an as-cast condition and after processing by high-pressure torsion (HPT) at room temperature for 20 turns. For the as-cast condition, the dissolution temperature was in the range of 634–658 K with an activation energy of 135 ± 9 kJ/mol. After HPT, the range of dissolution temperature decreased to 601–633 K, with a lower activation energy of 118 ± 10 kJ/mol. In both conditions, the Avrami and growth exponents are around 1.5, which suggests that the dissolved precipitates exhibit polyhedron-like morphology and that the dissolution process is dominated by bulk dissolution with a constant rate controlled by diffusion.
activation energy, dissolution, magnesium
Hanna, Abdelkader
ddb252e8-923c-429c-93e0-fd59742ddd0f
Azzeddine, Hiba
9d0bbd8e-680c-48d1-b27a-fbdd23cd2228
Avettand-Fènoël, Marie-Noëlle
3fbad585-0cd1-4178-9eac-dca6fa00b185
Baudin, Thierry
933b263a-4a22-4c65-9599-16b27346e946
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
5 September 2024
Hanna, Abdelkader
ddb252e8-923c-429c-93e0-fd59742ddd0f
Azzeddine, Hiba
9d0bbd8e-680c-48d1-b27a-fbdd23cd2228
Avettand-Fènoël, Marie-Noëlle
3fbad585-0cd1-4178-9eac-dca6fa00b185
Baudin, Thierry
933b263a-4a22-4c65-9599-16b27346e946
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Hanna, Abdelkader, Azzeddine, Hiba, Avettand-Fènoël, Marie-Noëlle, Baudin, Thierry, Huang, Yi and Langdon, Terence G.
(2024)
DSC analysis of dissolution reaction in an as-cast and HPT-processed Mg-Gd alloy.
Materials Letters, 376, [137293].
(doi:10.1016/j.matlet.2024.137293).
Abstract
The dissolution reaction kinetics were determined by differential scanning calorimetry (DSC) analysis for Mg-0.6Gd (wt.%) in an as-cast condition and after processing by high-pressure torsion (HPT) at room temperature for 20 turns. For the as-cast condition, the dissolution temperature was in the range of 634–658 K with an activation energy of 135 ± 9 kJ/mol. After HPT, the range of dissolution temperature decreased to 601–633 K, with a lower activation energy of 118 ± 10 kJ/mol. In both conditions, the Avrami and growth exponents are around 1.5, which suggests that the dissolved precipitates exhibit polyhedron-like morphology and that the dissolution process is dominated by bulk dissolution with a constant rate controlled by diffusion.
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Accepted/In Press date: 29 August 2024
e-pub ahead of print date: 1 September 2024
Published date: 5 September 2024
Keywords:
activation energy, dissolution, magnesium
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Local EPrints ID: 494060
URI: http://eprints.soton.ac.uk/id/eprint/494060
ISSN: 0167-577X
PURE UUID: 7554431c-e1a6-45f3-8c0d-c66282baf499
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Date deposited: 20 Sep 2024 17:03
Last modified: 21 Sep 2024 01:46
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Author:
Abdelkader Hanna
Author:
Hiba Azzeddine
Author:
Marie-Noëlle Avettand-Fènoël
Author:
Thierry Baudin
Author:
Yi Huang
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