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Columnar to equiaxed transition during growth of a univariant eutectic KU Leuven
In this work the transition from columnar to equiaxed growth is studied during the solidification of the univariant eutectic L -> alpha(Al) + theta-Al2Cu in the ternary Al-Cu-Ag system. The experimental technique used is upwards solidification with a controlled cooling rate. In the lower part of the sample where the temperature gradient is high, a cellular eutectic is observed. When the temperature gradient decreases, the morphology first ...
Investigations of phase transitions in liquid crystals by means of adiabatic scanning calorimetry KU Leuven
High resolution calorimetric techniques have substantially contributed in characterizing and understanding the delicate thermal behaviour near many phase transitions in liquid crystals. In this paper we describe a high-resolution adiabatic scanning calorimetric technique that has proven to be an important tool to discriminate between first-order and second-order phase transitions in addition to render high-resolution information on fluctuations ...
A phase-field model for multi-component and multi-phase systems KU Leuven
An alternative phase-field model is presented for the simulation of microstructure evolution in polycrystalline materials existing of multiple phases and components. The model is able to treat concurrently phase transformations, diffusion controlled coarsening (Ostwald ripening) and grain growth. The equilibrium phase fractions and compositions are introduced using appropriate thermodynamic Gibbs energy expressions. Furthermore, the model allows ...