3D original modelling of phase transformation/mechanics coupling : Effects of internal and external applied stresses on particle growth
Résumé
The elastic effects on particle growth were studied from a developed 3D original model that couples explicitly phase transformations and mechanical fields. This model is shown to be able to describe the time-evolution of both chemical and mechanical fields and their interactions in diffusive mass transport. In order to isolate and to analyse some generic effects of elastic fields, the model developed was applied to the growth of an initially single spherical precipitate into a supersaturated matrix in a finite media. We account for both internal and external applied stresses effects on the growth process including both thermo-kinetics and morphological aspects. In all cases studied, the elastic effects are shown to affect the transformation kinetics and equilibrium state. It is also demonstrated that the applied uniaxial compression loading induces an anisotropy of growth that affects both the morphological evolution and hence the equilibrium shape of the particle. This is shown to result to complex interactions between local pressure gradients and local composition gradients.
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