Microstructure simulation of aluminum alloy casting using phase field method

摘要

Numerical simulation of solidification microstructure of aluminum alloy casting is studied by using a macro-micro coupled method. Since it is difficult to compute the microstructure of a whole casting, a scheme is adopted that the temperature field is calculated on the whole casting, while the microstructure computation is carried out by selecting a cell in the central region of the casting. The growth of the dendrite is controlled by the solution of the phase field equation. The initial distribution of the temperature in the micro domain is obtained by interpolating the temperature of the cells near the selected cell. Thermal noise is introduced to produce the side branches. The simulation results are compared with those obtained experimentally.