A5065451545- Solidification and crystal growth phenomena
- Aluminum Alloy Microstructure Properties
- Metallurgical Processes and Thermodynamics
- High Temperature Alloys and Creep
- Metallurgy and Material Forming
- Microstructure and Mechanical Properties of Steels
- Additive Manufacturing Materials and Processes
- Magnesium Alloys: Properties and Applications
- nanoparticles nucleation surface interactions
- Manufacturing Process and Optimization
- Material Properties and Applications
- Microstructure and mechanical properties
- Machine Learning in Materials Science
- High Entropy Alloys Studies
- Aluminum Alloys Composites Properties
- Advanced Surface Polishing Techniques
- Electronic Packaging and Soldering Technologies
- Molecular Junctions and Nanostructures
- High-Temperature Coating Behaviors
- Metallurgical and Alloy Processes
- Advanced Materials Characterization Techniques
- Intermetallics and Advanced Alloy Properties
- thermodynamics and calorimetric analyses
- Metallic Glasses and Amorphous Alloys
- Welding Techniques and Residual Stresses
Access
2013-2024
Aging Community Coordinated Enterprises and Supportive Services (United States)
2009-2019
Access Community Health Network
2009-2019
Arab Community Center for Economic and Social Services
2009-2019
RWTH Aachen University
2006-2015
Karlsruhe Institute of Technology
1997
A multiphase-field model previously proposed by the authors is reformulated in a thermodynamically consistent form and extended to multicomponent systems. The phase-field diffusion equations, derived from free energy functional, are compared those postulated previous limit of binary alloy. constraint local quasiequilibrium, which equivalent postulate equal potentials for coexisting phases, deduced variational principle. Solute partitioning evaluation thermodynamic driving force phase...
Thermo-physical data of the semi-solid region in directionally solidified materials are difficult to obtain by experiments, but at same time high importance for prediction casting defects like freckles, hot-tears, or micro-porosity, and further provide input mesoscopic macroscopic models. This paper shows how phase fractions, compositions, enthalpies, densities, as well melt permeability can be obtained whole range between liquidus solidus temperature, an integral alloy-specific freckle risk...
In this paper, the effect of particle pinning on grain boundary motion is investigated by phase-field modeling. general, kinetics growth in multicrystalline materials determined interplay curvature driven and balance interfacial tension at vertices a network. A comprehensive way to treat both effects one model given approach. The specific feature multiphase-field used for investigation its ability each or phase with individual characteristics, together thermodynamic coupling which allows...
Abstract The development of a new steam turbine generation for use in advanced coal fired power plants with prospective operating temperatures beyond 700 °C and projected thermodynamic efficiency about 55 % requires, amongst other innovations, the partial substitution ferritic steels by wrought Ni‐base superalloys. Although alloys are already widely used aerospace industry, they faced demands regarding component size operation temperature, which far exceed current aero‐engine requirements....
Calculating microstructures for technical materials is an ambitious task which not only implies different length scales but also the complex thermodynamic properties of multicomponent and multiphase alloys. We report some recent progress in simulating microstructure evolution steels using multiphase-field software MICRESS®. Several applications are reviewed order to demonstrate current status applied phase-field techniques.
How can the microstructure of lightweight magnesium castings be controlled in industrial processes? By tuning alloy to process. To speed up search for optimal compositions related type casting process we employ CalPhad technique predicting stability primary and secondary phases Phase Field predict kinetics transformation morphology microstructure. The predictions are compared critical experiments. figure shows calculated outer zone a chill AZ31 alloy.
Understanding the complex phase transformations during additive manufacturing (AM) of low-alloy multi-phase steels is a necessary task to discover mechanisms that lead formation AM-specific, heterogeneous microstructures. In present study, investigations were carried out gain fundamental insights on microstructure evolution AM and upon post-AM heat-treatments. To this end, steel, with composition similar DP600 dual-phase (DP) was processed by laser powder bed fusion (L-PBF). Subsequently,...
The property of any material is essentially determined by its microstructure. Numerical models are increasingly the focus modern engineering as helpful tools for tailoring and optimization custom-designed microstructures suitable processing alloy design. A huge variety software available to predict various microstructural aspects different materials. In general frame an integrated computational materials (ICME) approach, these microstructure provide link between operating at atomistic or...
A two-dimensional model for solidification and secondary phase precipitation in directionally solidified superalloys is presented, which makes use of a shape function approximation the isothermal cross-section primary dendrites. The boundary represented by diffuse interface on finite difference grid, as phasefield methods. Thus, multicomponent diffusion can be calculated all phases. Via Fortran interface, coupled to thermodynamic databases assessed using 'calculation diagrams' (Calphad)...