Abstract: Eutectic alloys are the most widely used type of alloys in industry. Their microstructure is characterized by the simultaneous growth of two-phase or multi-phase solids from liquids. Its eutectic structure exists in the solid-liquid phase transition of many important structural and functional materials. And tilted eutectic is eutectic microstructure formed under the influence of many factors at a certain angle to the heat flow direction. Researchers began to explore the mechanism of tilted eutectic growth and the interface stability of eutectic growth. Tilted eutectic structure is beneficial to improve the material properties of eutectic structure, and has a guiding significance for solving many problems related to eutectic structure. It is believed that the surface tension with anisotropy has an effect on the production of tilted eutectic. Due to the order parameters continuous change of the solid-liquid interface in the phase field method, the problem of difficult tracking of solid-liquid interface during solidification is eliminated. The phase field simulation method is used to study the mechanism of tilted eutectic formation. The phase field simulation method was used to study the tilted eutectic growth mechanism, mainly by changing the process parameters and phase field parameters to observe the variation of the tilted eutecticmiscrostructure. For example, anisotropic have certain influence on the morphological evolution of tlited eutectic, and other parameters such as temperature gradient, solidification rate, convection condition, interfacial energy ratio and initial lamellar spacing have an important influence on the morphological evolution of tilted eutectic. By simulating the growth of tilted eutectic in solidification process with phase field method, the optimal physical parameters and phase field parameters corresponding to each material can be obtained, which is a new step not only in theory but also in industry. After decades of development, the phase field method has evolved from single-phase to multi-phase, from qualitative research to quantitative research, from two-dimensional phase simulation to three-dimensional phase field simulation. The phase field method simulation is getting more and more perfect. The simulation results of the microstructure change during solidification are getting much closer to the actual situation. In this paper, the effects of physical parameters and phase field parameters on the evolution of tilted eutectic microstructure in different dimensions are studied from the perspective of two-dimensional phase field simulation and three-dimensional phase field simulation. In the field of two-dimensional phase simulation, the scholars have made a series of breakthroughs, which prove that the anisotropy and convection have certain influence on the tilted eutectic. The initial lamellar spacing will change the eutectic growth mode. Temperature gradient, interface energy, solidification rate and diffusion coefficient also have a certain influence on the eutectic tilt angle. In the field of three-dimensional phase simulation, some achievements have also been made. The relationship between lamellar spacing and undercooling under different growth rates and elastic effects, anisotropy and temperature gradient on the changes of tilted eutectic microstructure, as well as the changes of diffusion coefficient and interface energy on the solid-liquid interface were have been studied. At the same time, there are still some problems in current research field, and the future research work is expected.
作者简介: 罗磊,2017年在中原工学院材料成型及控制过程获得学士学位。现为昆明理工大学大学材料科学与工程学院硕士研究生,在李向明教授的指导下进行研究。目前主要研究领域为倾斜共晶生长的机理。 李向明,昆明理工大学材料科学与工程学院教授、硕士研究生导师。2011年6月在北京科技大学材料加工工程专业取得博士学位。2011年七月进入昆明理工大学材料科学与工程学院,2019年8月被评选为教授。主要从事有色金属熔炼与成形技术,热加工过程中的模拟仿真,多孔金属材料制备的研究工作。近年来发表论文30余篇,包括Journal of Crystal Growth和 Journal of Applied Physics等。
引用本文:
罗磊, 李向明, 魏岑, 王献. 基于相场模拟的倾斜共晶生长研究进展[J]. 材料导报, 2020, 34(11): 11114-11120.
LUO Lei, LI Xiangming, WEI Cen, WANG Xian. Research Progress on Tilted Eutectic Growth Based on Phase Field Simulation. Materials Reports, 2020, 34(11): 11114-11120.
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2020, Vol. 34 
