Modeling of GP(I) zone formation during quench in an industrial AA7449 75 mm thick plate. (15th December 2016)

• Record Type: Journal Article
• Authors: Schloth, P.; Deschamps, A.; Gandin, Ch.-A.; Drezet, J.-M.
• Is Part Of: Materials & design. Volume 112(2016)
• Page Start: 46
• Page End: 57
• Publication Date: 2016-12-15
• Subjects: Al-Zn-Mg(-Cu) alloys -- Quenching -- GP(I) zones -- Precipitation modeling -- Vacancies; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.09.052
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: 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. Graphical abstract: