Numerical Simulation Of Solidified Microstructure By Coupled CA-PF Method Of Al Alloy

With the rapid development of science and technology, computer technology has also been progressed, they all provide the development platform for the numerical simulation of the engineering material. Based on Cellular Automata and Phase Field model, a new CA- PF model was coupled, and compared the difference of this model and the other two kinds of model.In the case of Phase Field model, simulate the growth of five grains of Al-4.5wt%Cu in different undercooling degree(△T=17.3K,△T=15.3K,△T=13.3K) and different grain spacing(Δx=21.21×10-6m,Δx =14.14×10-6m,Δx =7.07×10-6m).And compared the change of center grain bewteen non-isothermal condition and isothermal condition. The results show that center grain is the most easy to form spherulitic when △T=13.3K and Δx =7.07×10-6m. And the same condition, nonisothermal is more likely to form spherulitic than isothermal condition.We simulate the dendrite growth morphology of Al-4.5wt%Cu binary alloy in isothermal and dendrite morphology difference under different undercooling, based on the novel CA-PF model. Compared dendrite morphology, computational time efficiency, and interfacial diffusion layer among the novel CA- PF model, PF model and CA model. The results indicate that the CA- PF model conform to the dendrite growth theory, and appear the secondary dendrite arm when T0=912K. The dendrite radius of PF model is the maximumt, the dendrite radius of CA model is minimum, and CA-PF model is bewteen them. For time efficiency, CA model takes the least time, PF model takes the most time, and CA-PF model between them. The interface layer of CA-PF model is less smooth than that of PF model.