Meidani, H.Desbiolles, J.-L.Jacot, A.Rappaz, M.2012-06-012012-06-012012-06-01201210.1016/j.actamat.2011.12.049https://infoscience.epfl.ch/handle/20.500.14299/81251WOS:000303952000007A three-dimensional (3-D) multiphase-field model has been developed in order to study the formation of a micropore constrained to grow in a solid network (i.e. pinching effect). The model accounts for the pressure difference due to capillarity between liquid and gas, the equilibrium condition at triple (solid-liquid-pore) lines, and the partitioning and diffusion of dissolved gases such as hydrogen. From the predicted 3-D morphology of the pore, entities such as the interfacial shape distribution are plotted and analyzed. It is shown that the mean curvature of the pore-liquid surface, and thus also the pressure inside the pore, is uniform. The results are then compared with analytical pinching models. While predicting a similar trend, analytical models tend to underestimate the pore curvature at high solid fractions. Despite the complex morphology of pores reconstructed using high-resolution X-ray tomography, the present phase-field results suggest that a simple pinching model based on a spherical tip growing in between remaining liquid channels is a fairly good approximation. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.Casting defectsPorositySolidification microstructurePhase field modelingIn-Situ ObservationAl-Cu AlloysPorosity FormationPore FormationGrowthtext::journal::journal article::research article