存储能对合金晶粒长大影响的相场模拟研究

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

摘要:

采用优化加速的多相场模型，研究了存储能大小及分布方式对合金组织晶粒长大的影响。结果表明，模型实现并加速了较多的结构场变量组织演化，合金存储能升高，加快合金晶粒长大演化，平均晶粒尺寸增大，组织演化前中期高存储能晶粒降低组织中局域区域的晶粒尺寸均匀性；存储能分布非均匀性增加，可加速组织前中期存储能释放进程，获得较大尺寸晶粒，后期获得较小且更均匀的晶粒尺寸。本研究可为合金微观集成计算提供多晶几何模型，为高温变形后晶粒长大尺寸精细参数变化分析提供理论基础。

Abstract:

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.