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

Publication date: 15 December 2016
Source:Materials & Design, Volume 112
Author(s): P. Schloth, A. Deschamps, Ch.-A. Gandin, J.-M. Drezet
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.

Graphical abstract

http://ift.tt/2cSAbjZ