Monte Carlo simulation of microstructure development during solidification in Al-5% Cu alloy

摘要

Modeling and computer simulation of solidification phenomena in the Al 5 wt.% Cu binary metal system have been performed using the Monte Carlo technique to qualitativiely predict the influence of solidification conditions on the structure development in small castings. The established, two-dimensional model is a derivative of Srolovitz's model for recrystallizaton and grain growth, applied to solidification simulation by Spittle and Brown, and, in this investigation, modified by introducing constitutional undercooling and equalization of the solute element in the melt by diffusion. It also includes procedures which take into account heat and mass transfer, nucleation and growth of crystals. The obtained results are in a good agreement with the "big-bang" theory of solidification at smaller superheats (below 50℃). At higher superheats a constitutional undercooling seems to be the controlling factor of the columnar to equiaxied transition (CET).