Phase-Field Modeling of Eutectic Growth in Modified Al-Si Alloy

We have developed a phase-field model to investigate the evolution of eutectic silicon in Al-Si alloy. The interfacial fluctuations are included into a phase-field model of two-phasesolidification, as stochastic noise terms. We have discussed the dominant role of fluctuations in eutectic silicon formation. We have observed that silicon spherical particles nucleate on the foundation of primary aluminum phase. Their nucleation continues on concentric rings, throughthe Al matrix. The nucleation of silicon particles is attributed to the inclusion of fluctuations into the phase-field equations. We have found that the addition of fluctuations plays the role ofmodifiers in our simulations and is essential for phase-field modeling of eutectic growth in Al-Sisystem. The simulated finger-like Al phases and spherical Si particles are very similar to those of experimental eutectic growth in modified Al-Si alloy

کلیدواژه ها:

Phase-field model ، Al-Si alloy ، Eutectic growth ، Fluctuations