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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Frontiers in Solidification: An MPMD Symposium in Honor of Michel Rappaz
Presentation Title QQ-3: Macrosegregation and Grain Formation Caused by Convection Associated with Directional Solidification through Cross-Section Increase
Author(s) Masoud Ghods, Mark Lauer, Surendra Tewari, David Poirier, Richard Grugel
On-Site Speaker (Planned) Masoud Ghods
Abstract Scope Cylindrical Al-7 wt% Si, Al-19 wt% Cu and Pb-6 wt% Sb alloy samples were directionally solidified (DS) with liquid above, solid below, and gravity pointing down, in graphite crucibles having an abrupt cross-sectional increase. These alloys have similar solidification shrinkage but are expected to have different degrees of thermosolutal convection during solidification. Microstructures in the DS samples in the vicinity of the section change have been studied in order to examine the effect of convection associated with the combined influence of thermosolutal effects and solidification shrinkage. Extensive radial and axial macrosegregation associated with cross-section change is observed. It also appears that steepling and local primary α-phase remelting resulting from convection are responsible for stray grain formation at the reentrant corners. Preliminary results from a numerical model, which includes solidification shrinkage and thermosolutal convection in the mushy zone, indicate that these regions are prone to solutal remelting of dendrites.
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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