|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Defects and Properties of Cast Metals IV
||NOW ON-DEMAND ONLY – Understanding Effects of Oxide Bifilms on Solidification Microstructures by Multiscale Modeling
||Sepideh Kavousi, Mohsen Asle Zaeem
|On-Site Speaker (Planned)
The entrained oxide bifilms in casting of aluminum alloys act as cracks and degrade failure behavior of the products. In this study, a multi-scale computational approach is implemented to investigate how the oxide bifilms affect different stages of solidification of aluminum. Molecular dynamics (MD) is used to investigate if the bifilm surfaces serves as favored sites for heterogenous nucleation. MD results show no significant heterogenous nucleation on the oxide surface during the solidification of undercooled melt. By integrating Navier Stokes equations and phase-field modeling of solidification, we study the interaction between the growing dendrites and oxide bifilms. Based on the MD simulation findings, only formation of homogenous nucleation is considered and columnar to equiaxed transition is studied. This multi-scale model helps to quantify the effect of bifilm size and solidification condition (undercooling temperature, velocity, etc.) on solidification microstructures.
||Solidification, Modeling and Simulation, Aluminum