|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Solidification Processing of Light Metals and Alloys: An MPMD Symposium in Honor of David StJohn
||Understanding Compositional Effects of Dendritic Solidification via Directional Solidification and Cellular Automaton Simulation
||Colin D. Ridgeway, Cheng Gu, Alan A. Luo
|On-Site Speaker (Planned)
||Colin D. Ridgeway
The fundamental building block of alloy solidification is the nucleation and growth of primary dendrites. While a great deal of work correlates grains size and secondary dendrite arm spacing to mechanical properties of solidified products, growth of primary dendrites is often neglected. In this study, unidirectional solidification experiments were carried out on Al-Si-Mg alloys to examine the effect of compositional variation on dendritic growth and to develop a novel growth model. Where other models rely on commonly used parameters such as the growth restriction factor or inoculant particle efficacy, this model describes the growth of primary dendrites and subsequent secondary dendrite arms in terms on constitutional supercooling and dendritic growth velocity. Primary and secondary dendrites were measured and quantitatively analyzed in validation of the model. Using this methodology a novel 3D Cellular Automaton model was developed which has shown to assist in the simulation of location-specific microstructures in aluminum castings.