(591h) Phase Field Simulation for Rapid Solidification Couple with Solute Diffusion of Al-Cu Binary Alloy

The micro-structure patterns form during the solidification process and control the property of solid materials. In particular, a reliable model that predicts types of micro-structure growth during this rapid solidification process can help to predetermine the properties of the alloys. Among all the non-equilibrium thermodynamic models, the Phase-Field model has proven its efficiency to understand the microstructure evolution processes without any need to track complex kinetics of interface evolution explicitly. In this study, a phase-field model for dendritic growth of the Al-based binary alloy is simulated by the coupling phase-field method and asymmetry solute diffusion during the rapid solidification. The parameters such as concentration, undercooling rate, and anisotropy effects on the morphology of the dendrites are investigated. The results show that increasing solute concentration slows down the solute rejection at the interface for a hypoeutectic alloy until 6wt%Cu solute, at a higher undercooling rate the dendrites grow into a more developed form, and the length of the primary dendritic arm increases with the anisotropic effects.