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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Continuous Phase Transformations
Presentation Title Competitive Partitioning and Decomposition Evolution in Nanocrystalline Alloys
Author(s) Gregory B. Thompson, Xuyang Zhou, Reza Darvishi Kamachali, Jaber Rezaei Mianroodi, Alisson Kwiatkowski da Silva, Pratheek Shanthraj, Dirk Ponge, Baptiste Gault, Bob Svendsen, Dierk Raabe, Brad L. Boyce, Blythe G. Clark, Blythe G. Clark, Blythe G. Clark
On-Site Speaker (Planned) Gregory B. Thompson
Abstract Scope Spinodal decomposition is often described as a ‘barrier-free’ transformation. Unlike nucleation and growth, where defects play a dominate role in the nucleation of the secondary phase, such defects are largely considered inconsequential to this continuous phase transformation. At the nanoscale, where a high density of planar defects exist, their presence can have a profound influence on the temporal evolution of the transformation. In this presentation, the phase separation of a Pt(Au) nc alloy is characterized using a correlative method of electron diffraction and atom probe. A competition between interfacial segregation to the grain boundaries and spinodal decomposition is observed. Using a density-based phase field model for the grain boundary influence on the Gibbsian free energy for the transformation is used to elucidate how grain character influences the transformation. Furthermore, the presence of dislocations are also characterized revealing a distinct chemical structure in these defect structures.
Proceedings Inclusion? Planned:
Keywords Phase Transformations, Thin Films and Interfaces, Characterization


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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