|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Design and Simulation of Materials (CDSM 2018): Meso/Macroscale Simulations
||Lamellar Eutectic Growth under Natural Convection: A Phase-field-lattice Boltzmann Study
||Ang Zhang, Zhipeng Guo, Shoumei Xiong
|On-Site Speaker (Planned)
The influence of natural convection on the lamellar eutectic growth was determined by a comprehensive phase-field-lattice Boltzmann study for Al-Cu and CBr4-C2Cl6 eutectic alloys. The mass differences resulting from concentration differences led to the fluid flow and a robust parallel and adaptive mesh refinement algorithm was employed to improve the computation efficiency without any comprising accuracy. By means of carefully designed “numerical experiments”, the eutectic growth under natural convection was explored and a simple analytical model was proposed to predict the adjustment of the lamellar volume fraction. Moreover, several key mechanisms of eutectic growth were highlighted. The existence of natural convection controlled the interface shape and would strongly affect the growth undercooling. In particular, by alternating the initial lamellar spacing, the magnitude of solute expansion coefficient and undercooling, the microstructure evolution was presented and compared with the classical stability theory proposed by Jackson and Hunt.
||Planned: Supplemental Proceedings volume