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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Continuous Phase Transformations
Presentation Title Phase Competition in the Two Steps Continuous Phase Transformation during Solidification of Terbium
Author(s) Huajing (Wilson) Song, M.I. Mendelev
On-Site Speaker (Planned) Huajing (Wilson) Song
Abstract Scope 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.
Proceedings Inclusion? Planned:


Cluster Variation Model of Phase Behavior in Heusler-forming Alloy Systems
Competitive Partitioning and Decomposition Evolution in Nanocrystalline Alloys
Cross-Slip and Work-Hardening in Short-Range Ordered FCC Alloys
Effect of Bulk and Local Phase Transformation on Deformation Mechanisms
Interfacial Spinodals
Intrinsic Phase Stability and Continuous Phase Transformations in TiAlZrN Ultra-hard Nitride Coatings
Magnetically Driven Short-range Order in the CrCoNi System
Microstructural Engineering of Ni-based Superalloys Processed by Conventional and Additive Manufacturing
Phase-field Modelling of Transformation Pathways and Microstructural Evolution in MPEAs (Multi Principle Element Alloys)
Phase Competition in the Two Steps Continuous Phase Transformation during Solidification of Terbium
Short-range Clustering and Ordering Evolution of Ni-22Cr-13Mo Alloy
Structural Transformations Driven by Irradiation in the High Defect Density Limit
Study of Precipitation Behavior of High-Cr Ni-based Filler Metals Using In-situ S/TEM
Thermodynamics of the Invar Transition: Phonons vs. Magnetism

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