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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Frontiers in Solidification: An MPMD Symposium in Honor of Michel Rappaz
Presentation Title In-situ X-ray Observations Showing the Impact of Natural and Forced Convection on Dendritic Solidification
Author(s) Sven Eckert, Natalia Shevchenko, O. Roshchupkina, O. Sokolova
On-Site Speaker (Planned) Sven Eckert
Abstract Scope The directional solidification of Ga–25wt%In alloys was investigated using X-ray radioscopy, which offers a visual access to opaque melts and enables a basic, intuitional understanding of the complex interplay between melt flow and dendritic growth. Natural convection occurs owing to an unstable density stratification at the solid-liquid interface. Forced convection was produced by a rotating wheel. Our observations show a facilitation of the growth of primary trunks or lateral branches, suppression of side branching, dendrite remelting and fragmentation. The manifestation of all phenomena depends on the dendrite orientation, local direction and intensity of the flow. The forced flow eliminates the solutal plumes and damps the local fluctuations of solute concentration. It provokes a preferential growth of the secondary arms at the upstream side of the primary dendrite arms, whereas the high solute concentration at the downstream side of the dendrites can inhibit the formation of secondary arms.
Proceedings Inclusion? Undecided


A Criterion for Wavelength Selection in Pattern Forming Systems
Atomistic Modeling of Grain Boundary Melting and Pre-melting in Alloys
Atomistic, Experimental and Simulation Investigation on the Modification of Al-Si Alloys
Autogenous Interface Modulations
Bridging Multiple Length Scales in Solidification Modeling: What Can We Do, and What's Worth Doing?
Competitive Solidification Pathways and Glass Formation in Pd-Si-Cu Alloys
Complex Dynamics of Multiphase Solidification Front Patterns in Ternary Eutectic Alloys
Dendrite Arm and Grain Boundary Coalescence
Dendrite Growth Kinetics in Undercooled Melts of Intermetallic Compounds
Dendrite Orientation Transitions in Al-Zn Alloys
Divorced Eutectic Solidification of Mg-Al Alloys
Dynamics of Locked Eutectics in Thin Samples and Phase Orientation Relationships
Evolution of the Specific Solid-liquid Interface Area in Directional Solidification
Fast Crystal Growth in Glass-forming Liquids
Future Challenges in Solidification
Grain Structures and Segregations
Granular Modelling of Solidification and Semi-solid Defect Formation
Hot Tear Criterion Accounting for the Last Stage Precipitation Phenomena in the Solidification Path: A Refinement of the Rappaz Drezet Gremaud Approach
Hot Tearing: After the Rappaz-Drezet-Gremaud Criterion, Where Are We?
In-situ X-ray Observations Showing the Impact of Natural and Forced Convection on Dendritic Solidification
In Situ Characterization by Synchrotron X-ray Radiography of the Growth Dynamics of Equiaxed Grains in Al-10wt.%Cu Alloys
Influence of Icosahedral Ordering in the Liquid on Nucleation of a Solid: Atomistic Simulation Investigations
Inverse Methods and Temperature Gradients – An Expedient Combination for the Determination of Thermophysical Properties
Massive-like Transformation during and after Solidification in Fe-based Alloys
Microstructure and Phase Transitions under Large Undercooling Conditions
Microstructure Evolution in Containerless Solidification
Multi-scale Experiments and Modeling of Metal Alloy Solidification Dynamics
Multiphysics and Multiscale Modeling and Simulation of Solidification Processes
Multiscale Modeling of Columnar to Equiaxed Transition
Nonequilibrium Physics in Materials Research
Phase-field Crystal Modeling of Crystal Nucleation Including Homogeneous and Heterogeneous Processes, and Growth Front Nucleation
Phase-field Simulations of Dendritic Sidebranching in Three Dimensions
QQ-10: Anomalous Growth Behaviour in the Undercooled Al-Ni Alloy System
QQ-11: Upscaling from Mesoscopic to Macroscopic Solidification Models by Volume Averaging
QQ-12: Anisotropic Crystal Growth in bcc Metals: From Phase-field Crystal to Conventional Phase-field
QQ-1: Real-time Radiographic Observation of Equiaxed Dendrite Growth in Al-Ge Alloys
QQ-3: Macrosegregation and Grain Formation Caused by Convection Associated with Directional Solidification through Cross-Section Increase
QQ-4: In-situ Synchrotron X-ray Radiography Measurement of the Diffusion Zones during Equiaxed Solidification of Al-Cu Alloys
QQ-5: Physically Consistent Multiphase Field Theory of First Order Phase Transitions
QQ-6: Phase-field Simulation Study of Dendritic Grain Growth Competition during Directional Solidification of Alloys
QQ-8: The Model of Peritectic Phases Crystallization in the Zinc Coating
QQ-9: Computer Simulation of Freckle Formation Using a Three-Dimensional Micro-scale Model
Simulation of Crystal Sedimentation and Viscoplastic Behavior of Sedimented Equiaxed Mushy Zones
Single-Phase Filamentary Cellular Breakdown via Laser-Induced Solute Segregation
Solidification in 4D
Solute Precipitate Nucleation: Advances in Theory and Simulation Methods
Spreading of Liquid Pb Droplets on an Al Surface Exhibiting Solid-liquid Interfacial Premelting
Structural and Compositional Templating for Heterogeneous Nucleation
Study of Solidification Phenomena Using Phase Field Crystal Models
The Application of Oriented Alloy Single Crystals to the Study of Solidification, Mass Transport, and Related Phenomena: Prior Progress and Future Potential
Thermal-Fluid Model of Meniscus Behavior during Mold Oscillation in Steel Continuous Casting

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