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A "through-process" solidification homogenization numerical model to studythe microstructural evolution has been developed for AA7050 alloy. A continuumscale Direct Chill Casting (DCC) solidification model has been coupled with ameso-scale homogenization precipitation model to evaluate the radial variationof microstructure in a cylindrical DC cast billet after homogenization. TheLocal Solidification Times predicted by the DCC numerical model is used topredict the Secondary Dendritic Arm Spacing (SDAS) across the radius from anempirical relationship. It also predicts the macrosegregation used to estimatethe radial as-cast microstructures (phases and phase fractions) usingThermo-Calc. Macrosegregation affects the initial and homogenizedmicrostructures across the radius, making the surface prone torecrystallization, due to lesser dispersoids and larger precipitated particlesduring cooling, caused by lesser extent of Zenner pinning and ParticleStimulated Nucleation (PSN) of recrystallized grains respectively.

Radial Variation of Microstructure in a Direct-Chill Cast AA7050 Billet on Homogenization