Phase-Field Simulation of Influence of Stored Energy on Grain Growth in Alloys

The optimized accelerated multi-phase field model was used to investigate the influence of magnitude and distribution of stored energy on the grain growth of alloy microstructures. The results show that the model successfully simulates and accelerates the microstructure evolution of a system with multiple order parameters. An increase in stored energy of alloy accelerates grain growth, leading to an increase in average grain size. During the early-to-mid stages of microstructure evolution, grains with high stored energy reduce the uniformity of local grain sizes. An increase in the non-uniformity of stored energy distribution can expedite the release process of stored energy in the early-to-mid stages of microstructure evolution, leading to a larger grain size. In the later stage, smaller and more uniform grain size is obtained. This research develops a polycrystalline geometric model for integrated microscale simulation of alloys, providing a theoretical basis for analyzing fine-scale parameter changes in grain size after high-temperature deformation.