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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Continuous Phase Transformations
Presentation Title Effect of Bulk and Local Phase Transformation on Deformation Mechanisms
Author(s) Maryam Ghazisaeidi, Mulaine Shih, Edwin Antillon
On-Site Speaker (Planned) Maryam Ghazisaeidi
Abstract Scope Motivated by high entropy alloys (HEAs), we first study the dislocation behavior in the composition-dependent metastable fcc alloys. Transitioning from fcc to hcp stable phases in fcc alloys corresponds to a change from positive to negative average stacking fault energy (SFE). Using Molecular Dynamics simulations, we study the effect of average versus “local” SFE on the dislocation stability and its connection to the decorrelation force to break the partial dislocations from equilibrium in these alloys. Next, using our newly developed Multicell Monte Carlo method for phase prediction, we study the formation of local phases at dislocations and boundaries and their subsequent effect on deformation in model alloys. Our results provide a framework for a broader consideration of the effect of bulk and local phase transformations on deformation mechanisms in metallic alloys.
Proceedings Inclusion? Planned:
Keywords Computational Materials Science & Engineering, Phase Transformations, High-Entropy Alloys


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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