The Microstructure Numerical Simulation Research Of The Al-Cu Intermetallic Compound Using Cellular Automation Method

In the field of modern manufacturing and materials science,the metal solidification process and its microstructure evolution is a significant research direction.Using numerical simulation method,the nucleation process,grain growth and microstructure evolution can be displayed dynamically.Also,mechanical properties of castings can be effectively controlled by adjusting the solidification processing parameters.So,it is important to simulate the solidification structure to connect processing,structure and properties together.In this paper,the formation between Al-Cu metal ingot microstructure during solidification compound according to Cellular Automata Method was studied.In simulated tissue formation,all the cellular divided into three types:solid-state cellular,liquid yuan cellular and cellular growth,according to the cellular temperature and different states are nucleation,growth and capture calculations.On the basis of previous studies,this paper presented a more reasonable free energy model.In this model,the Gibbs free energy growth principle redefines the microstructure intermetallic compound ingot growth and acquisition process,and the model were taken into account the state of the state of cellular growth and its neighbor to neighbor unit cells and cellular-centric cellular neighbor state,based on the three conditions to determine the cellular growth process of growing up.By comparison with experimental results verify the accuracy of the model.Under the experimental conditions for hypereutectic Al-Cu alloys,the crystal growth eutectic of alloy Al₂Cu crystals was carefully studied.Directional solidification conditions,over Al₂Cu crystal temperature gradient along the direction of the alloy Al-Cu eutectic growth elongated cluster structure,its growth is slender needle tip,its outer crystal cluster center surrounded by small crystals grow outward expansion,and explains why.Latent heat of crystallization is mainly passed down through Al₂Cu crystal has been generated,resulting in the newborn Al₂Cu crystals tend to focus on the central bifurcation of crystal growth,eventually forming an irregular square cross-section.According to this model,by contrast hypereutectic aluminum copper alloy ingot microstructure simulation found that:under the Cellular to 100?m×100?m scale?mesoscale?can calculate the surface layer of fine-grained zone casting columnar grain zone and center equiaxed zone,and dendritic morphology clearer,more consistent with the experimental results.Research to enhance the organization of intermetallic compounds form evolution of understanding for the development of intermetallic compounds has great reference value.