Higher operating temperatures and dual microstructure disks are desired in the next generation of jet turbines.  Accurate physical modeling of grain coarsening is needed to accelerate alloy and process development to achieve desired mechanical properties, including creep and fatigue behavior.  The variation of distributions and volume fractions of secondary phases with thermal exposure control grain growth behavior and hence control grain coarsening.  Materials simulation and characterization techniques are being integrated and used simultaneously to understand the microstructural features that control grain coarsening and to develop physics-based predictive models.