Modeling of GP(I) zone formation during quench in an industrial AA7449 75mm thick plate

The GP(I) zone formation during quench is simulated in an industrial Aluminum alloy AA7449 75mm thick plate by using a multi-class precipitation model. For this purpose, results of in situ SAXS experiments are reported. A methodology is presented that takes advantage of the collected data to derive...

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Published in:Materials & Design 2016-12, Vol.112, p.46-57
Main Authors: Schloth, P., Deschamps, A., Gandin, Ch.-A., Drezet, J.-M.
Format: Article
Language:English
Subjects:
Al-Zn-Mg(-Cu) alloys
Diffusion coefficient
Engineering Sciences
Formations
GP(I) zones
Materials
Mathematical models
Precipitation modeling
Quenching
Reproduction
Simulation
Solubility
Thick plates
Vacancies
Yield strength
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Deschamps, A.
Gandin, Ch.-A.
Drezet, J.-M.
description The GP(I) zone formation during quench is simulated in an industrial Aluminum alloy AA7449 75mm thick plate by using a multi-class precipitation model. For this purpose, results of in situ SAXS experiments are reported. A methodology is presented that takes advantage of the collected data to derive i - a thermodynamic description for GP(I) zones from reversion heat treatments by using a solubility product and ii - the influence of excess vacancies on diffusion coefficients. This approach allows reproducing reasonably well the GP(I) zone formation measured during rapid cooling. Further, the simulated as-quenched surface yield strength compares well with experimental results reported in the literature. [Display omitted]
doi_str_mv 10.1016/j.matdes.2016.09.052
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subjects Al-Zn-Mg(-Cu) alloys
Diffusion coefficient
Engineering Sciences
Formations
GP(I) zones
Materials
Mathematical models
Precipitation modeling
Quenching
Reproduction
Simulation
Solubility
Thick plates
Vacancies
Yield strength
title Modeling of GP(I) zone formation during quench in an industrial AA7449 75mm thick plate
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