|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Continuous Phase Transformations
||Phase Competition in the Two Steps Continuous Phase Transformation during Solidification of Terbium
||Huajing (Wilson) Song, M.I. Mendelev
|On-Site Speaker (Planned)
||Huajing (Wilson) Song
The competition among multiple phases ultimately determines the final microstructures of the materials. Such competition can originate at the very beginning of the solidification process. In the current study, a new developed Terbium (Tb) EAM potential was used in molecular dynamics simulation. A two steps continuous phase transformation is observed during the solidification of Tb. The undercooling liquid will always transform to a metastable body-centered cubic (bcc) structures first, then further transform to the equilibrium hexagonal close-packed (hcp) phase. The hcp phase can only form in the last liquid droplet or at the bcc grain boundary, and behaves sensitive to the system pressure and grain boundary orientations. The hcp phase grows by a solid-state massive transformation. In some high driving force conditions, a martensitic transformation can be activated. The result indicated that the kinetic factor can play a significant role to determine the transition pass for the solidification process.