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Article Dans Une Revue Philosophical Magazine Année : 2012

Phase field modelling of grain boundary motion driven by curvature and stored energy gradients. Part I : theory and numerical implementation

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Résumé

During thermo-mechanical processing, the strain energy stored in the microstucture of an FCC polycrystalline aggregate is generally reduced by physical phenomena controlled, at least partially, by mechanisms involving dislocation cell or grain boundary motion such as recovery, recrystallisation and grain growth. This work presents a novel coupled phase field-single crystal constitutive framework capable of describing the microstructural evolution driven by grain boundary curvature and/or stored energy during recrystallisation and grain growth. Thus, the minimisation of stored and grain boundary energies provides the driving force for grain boundary motion. To describe interface motion, a phase field model taking into account the stored energy distribution is formulated and implemented within a continuum mechanics framework. The single crystal constitutive behaviour is described using a dislocation mechanics-based crystallographic formulation. The coupling between the grain boundary kinematics and the crystal plasticity formulation is made through the dislocation densities and the grain orientations. Furthermore, the free energy parameters are calibrated from existing Read-Shockley boundary energy data and those describing grain boundary mobilities from published experimental data.
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Dates et versions

hal-00750337 , version 1 (09-11-2012)

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Guillaume Abrivard, Esteban P. Busso, Samuel Forest, Benoit Appolaire. Phase field modelling of grain boundary motion driven by curvature and stored energy gradients. Part I : theory and numerical implementation. Philosophical Magazine, 2012, 92, pp.3618-3642. ⟨10.1080/14786435.2012.713135⟩. ⟨hal-00750337⟩
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