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VIRCAST Résumé de rapport

Project ID: G5RD-CT-2000-00153
Financé au titre de: FP5-GROWTH
Pays: France

Modelling of secondary precipitates formation and evolution based on the experimental characterization of the precipitation kinetics (including microstructure characterization)

INPL has developed a numerical model calculating the secondary precipitates formation and evolution during the homogenisation thermal treatment of a multi-component alloy.

The models of the physical mechanisms i.e. the nucleation, growth (and coarsening as a consequence) are based on classical law for nucleation, diffusion control for the growth. A coupling with the phase diagram software (Thermo-Calc) is realized and the effect of interface curvature on local equilibrium is included.

The input of the model are the chemical composition of the solid solution (given either by experiments or by a calculation of the solidification microstructure), the thermodynamic and diffusion data, and some additional parameters of the model (density of nucleation sites, interface energy).

Outputs of the model are the chemical composition of the matrix, the volume fraction of secondary precipitates, the mean size as well as the size distribution of precipitates at any time of the thermal treatment.

The model is able to take into account variable concentration of the volume considered, and can thus be coupled to a homogenisation model.

The model is validated against experimental data obtained on AA3003 alloy for well-controlled thermal treatments of the AA3003 alloy. Comparisons of overall precipitation kinetics as well as the evolution of size, density, and chemical composition of precipitates are conducted.

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