A model for strengthening of Al-Cu-Mg alloys by S phase
A model for strengthening of Al-Cu-Mg alloys by S phase
An age hardening model has been developed to predict the yield strength of Al-Cu-Mg alloys with composition within the a+S phase field of the phase diagram. The model describes the microstructure evolution and strengthening of these alloys by considering the formation and dissolution of two types of precipitates: S phase and pre-precipitates in the form of clusters. Strengthening caused by clusters and S phase is described by the modulus strengthening mechanism and the Orowan (precipitate by-passing) mechanism, respectively. The model contains a new, relatively simple treatment for the precipitation kinetics of S phase, which includes a progressive transition from the nucleation/growth regime to the coarsening regime. The model predictions are in good agreement with the measured yield strengths of a solution treated, stretched and subsequently aged Al-Cu-Mg alloy, and all model parameters are either entirely predictable or physically reasonable. The modelling accuracy on unseen data is about 10MPa. Combined with previous 3DAP results, analysis of DSC and TEM results of these alloys show that the main precipitates were S phase and its precursor in the form of clusters, which is consistent with the model. A semi-quantitative analysis of the evolution of the S phase formation effect in DSC experiments on samples aged for a range of ageing times is also consistent with model predictions.
119-126
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Yan, J.
575a4f24-5025-4852-824a-9bc0fc40f20d
2003
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Yan, J.
575a4f24-5025-4852-824a-9bc0fc40f20d
Starink, M.J. and Yan, J.
(2003)
A model for strengthening of Al-Cu-Mg alloys by S phase.
1st International Symposium on Metallurgical Modeling for Aluminum Alloys, ASM Materials Solutions, Pittsburgh, USA.
11 - 14 Oct 2003.
.
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Conference or Workshop Item
(Paper)
Abstract
An age hardening model has been developed to predict the yield strength of Al-Cu-Mg alloys with composition within the a+S phase field of the phase diagram. The model describes the microstructure evolution and strengthening of these alloys by considering the formation and dissolution of two types of precipitates: S phase and pre-precipitates in the form of clusters. Strengthening caused by clusters and S phase is described by the modulus strengthening mechanism and the Orowan (precipitate by-passing) mechanism, respectively. The model contains a new, relatively simple treatment for the precipitation kinetics of S phase, which includes a progressive transition from the nucleation/growth regime to the coarsening regime. The model predictions are in good agreement with the measured yield strengths of a solution treated, stretched and subsequently aged Al-Cu-Mg alloy, and all model parameters are either entirely predictable or physically reasonable. The modelling accuracy on unseen data is about 10MPa. Combined with previous 3DAP results, analysis of DSC and TEM results of these alloys show that the main precipitates were S phase and its precursor in the form of clusters, which is consistent with the model. A semi-quantitative analysis of the evolution of the S phase formation effect in DSC experiments on samples aged for a range of ageing times is also consistent with model predictions.
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Published date: 2003
Venue - Dates:
1st International Symposium on Metallurgical Modeling for Aluminum Alloys, ASM Materials Solutions, Pittsburgh, USA, 2003-10-11 - 2003-10-14
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Local EPrints ID: 22465
URI: http://eprints.soton.ac.uk/id/eprint/22465
PURE UUID: d32f9b8a-2481-458e-8caa-f0834d157cd6
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Date deposited: 01 Jun 2006
Last modified: 08 Jan 2022 03:48
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Author:
J. Yan
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