ZURUECK HOCH VOR INHALT SUCHEN

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Proposing Institution

Karlsruher Institut für Technologie, Hochschule Karlsruhe
Project Manager

Dr. Johannes Hötzer
Strasse am Forum 7
76131 Karlsruhe
Abstract
Ecological and economical demands require the development of materials with tailored microstructures and properties. The process conditions during the directional solidification of a eutectic alloy directly influence the scale and the type of the arising microstructure and hence the resulting macroscopic properties. Due to an increase of the growth velocity the evolution of eutectic colonies can be observed. The underlying mechanisms resulting in these characteristic structures involve different length scales of coarse colony cells and fine eutectic structures. To investigate the temporal evolution of this morphology in three-dimensions, large-scale parallel phase-field simulations of the eutectic NiAl-34Cr alloy are conducted. The microstructure evolution is quantitatively assessed by measurements of rod and colony spacings, shape factors, average front undercoolings and growth velocities.Further the microstructure adjustment events occurring during the evolution of eutectic colonies are investigated. Solving the computationally intensive model in statistical volume elements and in reasonable time requires a high computational effort with more than 200 000 CPUh which are only provided by current Tier-0 systems like the SuperMUC.

Impressum, Conny Wendler