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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Solid State Precipitation
Presentation Title Atomic Theory of Spinodal Decomposition
Author(s) Maylise Nastar
On-Site Speaker (Planned) Maylise Nastar
Abstract Scope The phenomenological theories currently used to describe phase decomposition in solids fail to predict the early stage of a spinodal decomposition mainly because they rely on local equilibrium assumptions. Within the Self-Consistent Mean Field (SCMF) theory, it is shown that spinodal decomposition and more generally kinetics of nanoscale composition fluctuations are correctly described if deviations of short range order from local equilibrium are accounted for. The resulting structure function of a binary system is controlled by a sum of exponential laws, in agreement with atomic Monte Carlo simulations and small angle scattering observations of spinodal decomposition. Moreover, in the case of a point defect diffusion mechanism, diffusion of atoms is non random and the inter-diffusion coefficient controlling the concentration fluctuations is shown to be in discrepancy with a Cahn-Hilliard like formulation. These theoretical results are applied to the modeling of spinodal decomposition in Fe-Cr alloys.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

An Experimental and Modelling Study on Precipitation during Tempering of Martensitic Alloys
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Atom Probe Characterization of Phase Separation during Age Hardening of a U-6wt.%Nb Alloy
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Carbide Precipitation during Heating in Martensitic Steels
Clustering and Precipitation in Al-Cu-Li Alloys: Influence of Minor Solute Additions on the Competition between Kinetic Paths
Effect of Ca Additions on the Ageing Behavior of Mg-15Gd-0.5Zr Alloy
Effect of Metalloid Addition on Anomalous Primary Crystallization of Al-RE Metallic Glasses
Effects of Clustering and Trace Elements on Precipitation Hardening of Al-Mg-Si Alloys
Formation of Complex Intermetallic Phases from Supersaturated Co Solid Solution in a Co-3.9Nb Alloy
Hydride Precipitates in Zirconium Alloys: Evolution of Dissolution and Precipitation Temperatures during Thermal Cycling Correlated to Microstructure Features
Investigating the Formation Path of Delta Hydrides in Zirconium Fuel Rod Claddings by Multi-Phase Field Modeling
Kinetics of Discontinues Precipitation upon Age-hardening of Deformed and Recrystallized Invar-Sn Alloys
L-183: Analysis of Beta´ Cu4Ti Precipitation in Cu-Ti Alloys by Conventional and Diffusion-couple Methods
L-184: Carbide Precipitation in a Low-alloy Ferritic Steel
L-185: Nanocomposites Ti/B/TiO2 by Mechanical Alloy Synthesis
Morphology and Phase Stability of Pt Nanostructures in Dense Transition Alumina Formed by Solid-state Precipitation
Precipitate Structures in Mg Alloys Containing Nd and Y
Precipitation Behavior in Ni-Ti-Zr Shape Memory Alloys
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Prediction of Size, Temperature and Composition-dependent Precipitate/Matrix Interfacial Energies
Self-organization by Strain Accommodation in the Formation of Long-range Stacking Order Structure in Mg-RE-TM Alloys
Spinodal Decomposition and Ordering Transformation in U6Nb Alloy
The Effects of ECAP on the Precipitation Behavior of Al 2024
The Role of Electron Microscopy in the Understanding of Precipitation in Light Alloys
Understanding the Precipitation and Orientation Relationships in Transition Metal Carbides and Nitrides

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