|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Frontiers in Solidification: An MPMD Symposium in Honor of Michel Rappaz
||QQ-6: Phase-field Simulation Study of Dendritic Grain Growth Competition during Directional Solidification of Alloys
||Damien Tourret, Younggil Song, Amy J Clarke, Alain Karma
|On-Site Speaker (Planned)
Since the pioneering experiments of Esaka, Kurz, Trivedi and co-workers in the 1980’s, much has evolved in our understanding of polycrystalline dendritic microstructure selection. Yet, while both observations and calculations have challenged the classical description of polycrystalline columnar growth by Walton and Chalmers, some key mechanisms still warrant investigation. For instance, quantitative analyses are still lacking for the dynamical selection of grain boundaries orientation. Meanwhile, recent advances in large-scale simulations have opened the way to detailed studies of such complex mechanisms.
We present a computational study of columnar dendritic growth competition in directional solidification. Using quantitative phase-field simulations, we study diffusive interactions between grains and explore a wide range of processing parameters, such as grain orientations in a bi-crystalline binary alloy. Using comparisons to available experimental data in transparent and metallic alloys solidified under predominantly diffusive conditions, we provide new insight into competitive growth mechanisms in dendritic microstructures.