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Résumé :
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A real-valued random field {Zi,j} with piecewise constant samples and defined on a lattice L in [openface R]2 is developed to characterize two-dimensional metallic polycrystals. The subsets defined by constant values of {Zi,j} are virtual grains and the values of {Zi,j} give Euler angles at the nodes of L. The field {Zi,j} is completely defined by its marginal distribution and conditional probabilities associated with the nearest neighbor model. The defining probabilities of {Zi,j} need to be estimated from measurements of atomic lattice orientation. Random fields {Zi,j} calibrated to the measurements of crystallographic texture in two AA7075 aluminum plates have been used to generate virtual polycrystals. Virtual and actual polycrystals are similar.
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