The Study Of Microstructure Numerical Simulation Of Aluminum Alloy Under Solidification Process Using Phase-field Method

Microstructure numerical simulation has important signification to the development andapplication of metal material,and also it is one of the mostly direction in the domain ofmaterial science.Modeling of microstructure formation using computer numerical simulationwill help to evaluate the castings processing technology so as to improve theirquality . Therefore microstructure formation simulation using phase-field method hassignificant practical merit. phase-field method is one of the hotspots of the numericalsimulation during solidification processes at present.In this paper,the dendrite growth of puresubstance and aluminum alloy are simulated using phase-field method.the dendrite growthbehaviors under the different conditions are finely studied,and the mechanism of the dendritegrowth is discussed.Based on the theory of metal solidification,The phase-field models of pure substance isderived successfully used to set up a two-dimensional mathematics in consideration of theinterface anisotropy and noise.The phase-field simulation program of the dendrite growth iscompleted on the basis of the Finite Difference method with uniform grids.The dependenceof simulation results on the anisotropy , disturbing, the initial nucleus radius andundercooling studied,and how to choose the values of these parameters is settled.Based on the windows 2000,Visual Fortran 6.0 has been used to set up this simulationsystem.This system can be used to simulation the dendrite growth behaviors of puresubstance and aluminum alloy.The result is consistent with the classic theory of solidificationmold-filling experiments are conducted to verify the simulated results and they are ingood agreement. The calculated results show that the phase-field method is more consistentwith the practical growth phenomenon and justified that our application programs.