Phase-field modeling of microstructure evolution during solidification in presence of gas bubble

The microstructure evolution during solidification of pure Aluminum metal with gas bubble nucleation and growth is modeled and simulated by the phase-field method. Interface microstructure formation in the presence of gas bubble is simulated to investigate the interaction between gas bubble and microstructural evolution, and also a pressure correction equation is implemented to study the effect of pressure difference between the bubbles and melts. Results indicate that pressure difference between gas bubble and the liquid melt can significantly affect the gas atoms diffusion near the gas-liquid interface, which will lead to the bubble growth velocity change. These simulation results are in agreement with experimental observations. (C) 2015 Elsevier B.V. All rights reserved.