Low-temperature decomposition of Al-Mg alloys: Guinier-Preston zones and L12 ordered precipitates
Low-temperature decomposition of Al-Mg alloys: Guinier-Preston zones and L12 ordered precipitates
Low-temperature (below 100°C) ageing experiments were performed on ice-water quenched and on slowly cooled Al-Mg alloys with 11, 14 and 16 at% Mg. Differential scanning calorimetry (DSC) generally reveals two overlapping endothermic events in the range 50-150°C which are identified to be due to the dissolution of Guinier - Preston (GP) zones and the spherically shaped L12 ordered β" phase precipitates. Data on the stability limits of GP zones and β" phase are obtained from isothermal calorimetry and DSC experiments. Our data on the solvi agree well with literature values provided that resistometry data, which are inconsistent with all other data, are not considered. Possible reasons for the unreliability of the latter are discussed and new solvus lines for GP zones and β" phase are presented.
DSC, calorimetry, clusters, GP zones, precipitation, diffusion, solubility, hardening, TEM, L12, ordered phase
701-714
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Zahra, A.-M.
602ec757-47a9-47dc-9739-1ba7a0e0d3db
1997
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Zahra, A.-M.
602ec757-47a9-47dc-9739-1ba7a0e0d3db
Starink, M.J. and Zahra, A.-M.
(1997)
Low-temperature decomposition of Al-Mg alloys: Guinier-Preston zones and L12 ordered precipitates.
Philosophical Magazine, 76 (3), .
(doi:10.1080/01418619708214031).
Abstract
Low-temperature (below 100°C) ageing experiments were performed on ice-water quenched and on slowly cooled Al-Mg alloys with 11, 14 and 16 at% Mg. Differential scanning calorimetry (DSC) generally reveals two overlapping endothermic events in the range 50-150°C which are identified to be due to the dissolution of Guinier - Preston (GP) zones and the spherically shaped L12 ordered β" phase precipitates. Data on the stability limits of GP zones and β" phase are obtained from isothermal calorimetry and DSC experiments. Our data on the solvi agree well with literature values provided that resistometry data, which are inconsistent with all other data, are not considered. Possible reasons for the unreliability of the latter are discussed and new solvus lines for GP zones and β" phase are presented.
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Published date: 1997
Keywords:
DSC, calorimetry, clusters, GP zones, precipitation, diffusion, solubility, hardening, TEM, L12, ordered phase
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Local EPrints ID: 21702
URI: http://eprints.soton.ac.uk/id/eprint/21702
ISSN: 0141-8610
PURE UUID: 4e53228c-e482-4c3c-a082-6b08eccb60e0
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Date deposited: 31 Jan 2007
Last modified: 15 Mar 2024 06:32
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Author:
A.-M. Zahra
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