Computational method for dynamic coupling analysis of macroscopic deformation and morphological change in microstructure

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Computational method is developed using a phase field model which accounts for the coupling effects among phase, temperature and stress/strain, so that the macroscopic behavior of metallic material is described in accordance with the dynamic change in the microstructure. Simulations on microscopic stress distribution in complex microstructure such as dendrites or polycrystals are enabled using the developed method. The equations are then extended for binary alloy system, and the local concentration of each composition is coupled with the phase and stress fields. The subsequent simulation revealed complicated stress is generated in a cellular microstructure formed in directional solidification.