Project Details
Projekt
SPP 1120: Phase Transformations in Multi-Component Melts
Subject Area
Materials Science and Engineering
Term
from 2001 to 2008
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 5471218
The priority programme aims to develop a detailed understanding and description of phase transformations in multicomponent melts. The scientific work focuses on solidification. Liquid-liquid separation is also subject of the studies. Modern experimental techniques are applied to measure propeties of the melt and the kinetics of the solidification front. The experiments are theoretically described by using and developing proper models and test them by computer simulation. Taking the results together this may lead to a virtual design of materials in the computer. The objectives are grouped into
* transport properties
The parameters of heat and mass transport are determined in the liquid
state, since they control the dynamics of the solidification front. In this respect, specific heat, heat of crystallization, thermal expansion, heat conductivity, diffusion, viscosity and the interfacial energy are of particular interest.
* dynamics in the melt
The atomic dynamics (on a microscopic scale) is investigated since it
affects both atomic ralaxation behaviour and short range ordering in the liquid. These processes are of great importance to understand the atomic attachement from the liquid to the solid phase. Also, the study of fluid dynamics (on a macrospic scale) by natural and forced convection in liquids are subject of the priority programme.
* kinetics of solidification
The solidification pathway is observed in situ by proper diagnostic means including the utilization of synchrotron radiation. The kinetics of the solidification front is measured in dependence on various experiment parameters as concentration and undercooling. The experimental results are analysed within theories in order to test their validity on the application of casting and other production routes.
* modelling in the computer
The models to describe the phase transformations (e.g. phase field
modelling, Lattice Boltzmann etc.) are continuously developed. All modern techniques of simulation are applied as molecular dynamics, monte carlo simulation, method of finite elements to treat both continuous and discontinuous systems.
* transport properties
The parameters of heat and mass transport are determined in the liquid
state, since they control the dynamics of the solidification front. In this respect, specific heat, heat of crystallization, thermal expansion, heat conductivity, diffusion, viscosity and the interfacial energy are of particular interest.
* dynamics in the melt
The atomic dynamics (on a microscopic scale) is investigated since it
affects both atomic ralaxation behaviour and short range ordering in the liquid. These processes are of great importance to understand the atomic attachement from the liquid to the solid phase. Also, the study of fluid dynamics (on a macrospic scale) by natural and forced convection in liquids are subject of the priority programme.
* kinetics of solidification
The solidification pathway is observed in situ by proper diagnostic means including the utilization of synchrotron radiation. The kinetics of the solidification front is measured in dependence on various experiment parameters as concentration and undercooling. The experimental results are analysed within theories in order to test their validity on the application of casting and other production routes.
* modelling in the computer
The models to describe the phase transformations (e.g. phase field
modelling, Lattice Boltzmann etc.) are continuously developed. All modern techniques of simulation are applied as molecular dynamics, monte carlo simulation, method of finite elements to treat both continuous and discontinuous systems.
DFG Programme
Priority Programmes
International Connection
Austria
Projects
- Analysis of dendrite growth theory and solidification of metallic melts at small undercooling (Applicant Herlach, Dieter M. )
- Bestimmung von Schlüsselparametern der Phasenumwandlungskinetik mittels Untersuchungen an mesoskopischen Modellsystemen (Applicants Herlach, Dieter M. ; Palberg, Thomas )
- Computer simulation of the phase behavior and transport phenomena in more-component mixtures (Applicant Binder, Kurt )
- Coupled growth of the invariant eutectic in a ternary alloy (Applicant Rex, Stephan )
- Elastizität und Strukturbildung in erstarrenden Legierungen (Applicant Kassner, Klaus )
- Evolution of microstructure and phase during solidification of Nd-Fe-B melts and its modification by hydrodynamic effects (Applicant Hermann, Regina )
- Formation of bulk metallic glass matrix composites during the melt´s cooling (Applicant Schneider, Susanne )
- Grenzflächenspannung und Benetzungserscheinungen in flüssigen metallischen Mischungslückensystemen (Applicant Hoyer, Walter )
- Koordination des Schwerpunktprogrammes (Applicant Herlach, Dieter M. )
- Magnetically controlled texture development in hexagonal metals and alloys (Applicant Molodov, Dmitri A. )
- Measurement of solid-liquid interface energy in ternary alloy systems (Applicant Ludwig, Andreas )
- Melting and solidification of fine-scaled alloy particles (Applicant Wilde, Gerhard )
- Messung der fest/flüssig-Grenzflächenenergien in ternären Systemen (Applicant Bührig-Polaczek, Andreas )
- Micro convection in the interdendritic region during directional solidification (Applicant Steinbach, Ingo )
- Molekulardynamik Modellierung atomarer Prozesse der Kristallisation metallener Legierungsschmelzen (Applicant Teichler, Helmar )
- Monotectic composite growth (Applicant Ratke, Lorenz )
- Phasenfeldmodellierung der Erstarrung in mehrkomponentigen und mehrphasigen Legierungssystemen (Applicant Nestler, Britta )
- Phasenfeldmodellierung der Erstarrung in mehrkomponentigen und mehrphasigen Legierungssystemen (Applicant Garcke, Harald )
- Phasenfeldmodellierung der Erstarrung in mehrkomponentigen und mehrphasigen Legierungssystemen (Applicant Nestler, Britta )
- Rechner- und experimentgestützte Bestimmung der Oberflächenspannung flüssiger multikomponentiger Stähle (REXOS) (Applicant Egry, Iván )
- Schmelzen und Erstarren unter elastischem und hydrodynamischem Einfluß (Applicant Müller-Krumbhaar, Heiner )
- Structure formation in multi-component Nd-base alloys (Applicants Eckert, Jürgen ; Schultz, Ludwig )
- Strukturbildung in mehrkomponentigen Nd-Basis-Legierungen (Applicant Hermann, Helmut )
- Strukturbildung in mehrkomponentigen Nd-Basis-Legierungen (Applicant Wiedenmann, Albrecht )
- The measurement of the thermophysical parameters of undercooled metallic melts with a modified and extended electrostatic levitation and heating unit (Applicant Ryder, Peter )
- Thermal expansion and surface tension of liquid multicomponent alloys shall be measured using the oscillating drop machine (Applicant Egry, Iván )
- Thermodynamics with phase formation in Al-Si-X1-X2 liquid alloys with grain refining alloying additions (Applicant Schmid-Fetzer, Rainer )
- Untersuchung der Diffusion in mehrkomponentigen Metallschmelzen nahe des Schmelzpunktes (Applicant Banhart, John )
- Untersuchung der Phasenbildung in Nd-Fe-B-Schmelzen mit Synchrotron-Strahlung (Applicant Herlach, Dieter M. )
- Untersuchung der Viskosität und Diffusion von ternären Ni- und Zr-Schmelzen im eutektischen Bereich (Applicant Neumann, Hartmut )
- Untersuchung des Einflusses der atomaren Dynamik auf Materietransport, Segregation und Erstarrung mehrkomponentiger Schmelzen (Applicants Holland-Moritz, Dirk ; Meyer, Andreas )
- Verbesserung der Mehrskalensimulation für Phasen- und Mikrostrukturbildung in Nd-Fe-B Schmelzen (Applicant Emmerich, Heike )
Spokesperson
Professor Dr. Dieter M. Herlach (†)
