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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Materials Research in Reduced Gravity
Presentation Title Phase-field Modeling of Cellular and Dendritic Microstructure Formation during Directional Solidification of Binary Alloys under Diffusive Growth Conditions: Dynamical Selection of the Primary Spacing
Author(s) Younggil Song, Jean-Marc Debierre, Damien Tourret, Fatima Lisboa Mota, Nathalie Bergeon, Rohit Trivedi, Rahma Guérin, Bernard Billia, Alain Karma
On-Site Speaker (Planned) Younggil Song
Abstract Scope We have carried out three-dimensional phase-field simulations to model unique experimental observations of cellular and dendritic array structures formed under diffusive growth conditions aboard the International Space Station. We investigated two effects on the dynamical selection of the array spacing. The first is a recently characterized drift of isotherms inherent to the directional solidification set-up. Simulations show that this drift leads to a substantial increase of the dynamically selected spacing, thereby improving the quantitative agreement between simulated and observed spacings. Secondly, we investigated the effect of a finite misorientation between the principal crystal axes and the temperature gradient axis. Simulations show that this misorientation induces a slow spatiotemporal evolution of the array spacing towards a uniform spacing. This spacing is close to the upper limit of the stable range of spacings governed by tertiary branching and is larger than the spacing selected by the transient recoil of the interface.
Proceedings Inclusion? Planned: A print-only volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Review on Thermophysical Property Measurements of Liquid Metallic Drops on Parabolic Flights, Texus Rocket Flights and the International Space Station
Analysis of a Rotating Magnetic Field on the THM growth of CZT in Microgravity
Analysis of Particle Engulfment Dynamics during Solidification
Coarsening of Dendrites in Solid-Liquid Mixtures: The Low Volume Fraction Limit.
Crystal Nucleation and Growth from Levitated Aqueous Solutions Using Electrostatic Levitation
Dendritic Growth Kinetics in Undercooled Melts of Pure Fe under Static Magnetic Fields
Dynamics of Eutectic Solidification Patterns in Diffusive Conditions
Dynamics of Microstructure Formation in 3D Directional Solidification of Transparent Model Alloys under Microgravity: Analysis of the Primary Spacing Evolution
Effect of Thermal Drift on the Initial Transient Behavior in Directional Solidification of a Bulk Transparent Model Alloy
Electromagnetic Levitation Processing on the International Space Station
Evaluation of the MICAST#2-12 Al-7wt%Si Sample Directionally Solidified Aboard the International Space Station
Growth Morphology and Velocity of Undercooled Fe-B Alloys under Different Fluid Flow Conditions
In Situ Investigation of the Effects of Gravity Level Variations on the Directional Solidification Microstructures during Parabolic Flights
Influence of Convection on the Dendrite/Eutectic Growth Velocity in Cu-Zr Alloys (project MULTIPHAS)
Installation and Operation of the Electromagnetic Levitator EML on ISS and Experiment Preparation
Metallic Liquid Structures, Properties, and Phase Transitions – Ground-Based Studies for ISS Experiments
Metastable Phase Formation from Undercooled Melt in Peritectic Systems under Terrestrial and Microgravity Conditions: Fe-Co vs. Ti-Al
Microstructure Evolution in Undercooled Al-Fe Melts
Modeling of Gravitational Effects on Particle Settling and Shape Distortion During Liquid-Phase Sintering of Tungsten Heavy Alloys
Numerical Simulation of the Oscillation and Damping of Core-Shell-Structured Iron-Slag Droplets for the Measurements of Surface Tension and Viscosity in Reduced Gravity
Phase-field Modeling of Cellular and Dendritic Microstructure Formation during Directional Solidification of Binary Alloys under Diffusive Growth Conditions: Dynamical Selection of the Primary Spacing
Rapid Quench in an Electrostatic Levitator
Reduced-gravity Measurements of the Effect of Oxygen on Properties of Zirconium
Simulation of Shrinkage-induced Segregation in Multicomponent Multiphase Alloys during Reduced-gravity Solidification
Thermophysical and Kinetic Properties of Fe60Cr21Ni19 - Measurements under Reduced Gravity Conditions

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