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

Patrick Schloth (1, 2) , Alexis Deschamps (3) , Charles-André Gandin (4) , Jean Marie Drezet (2)

1 PSI - Paul Scherrer Institute
2 Computational Materials Laboratory
3 SIMaP - Science et Ingénierie des Matériaux et Procédés
4 CEMEF - Centre de Mise en Forme des Matériaux

The GP(I) zone formation during quench is simulated in an industrial Aluminum alloy AA7449 75 mm 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.

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Patrick Schloth, Alexis Deschamps, Charles-André Gandin, Jean Marie Drezet. Modeling of GP(I) zone formation during quench in an industrial AA7449 75mm thick plate. Materials & Design, 2016, 112, pp.46 - 57. ⟨10.1016/j.matdes.2016.09.052⟩. ⟨hal-01410400⟩