|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Applications of Solidification Fundamentals
||Dendritic Grain Growth Competition in Directional Solidification of Alloys: A Phase-field Study
||Damien Tourret, Younggil Song, Amy J Clarke, Alain Karma
|On-Site Speaker (Planned)
Grain growth competition in polycrystalline materials is essential to the formation of cast grain structures. Yet, despite numerous experimental observations over the past decades, a comprehensive picture of dendritic grain growth competition is still lacking. Using phase-field simulations, we study the formation of grain boundaries (GBs) during directional solidification. We focus on the GB orientation selection between two competing grains and explore its dependence upon the orientation of the two grains. We identify orientation combinations that behave according to classical theory, and the occurrence of “unusual overgrowth” of favorably oriented dendrites. In three dimensions, we study the effect of the azimuthal crystal orientations in a thin sample. We identify the combinations of orientations yielding a quasi-2D behavior, and the orientations promoting unusual overgrowth events. Resulting insight into dynamical GB formation could yield significant improvements and progress in casting simulations at larger length and time scales.
||Planned: Supplemental Proceedings volume