|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials
||3D Characterization of the Evolution of Crystal Mosaicity During Solidification
of Single Crystal Ni-based Superalloys
||Felicitas Scholz, Daniel Kotzem, Pascal Thome, Jan Frenzel, Gunther Eggeler
|On-Site Speaker (Planned)
The present work investigates the formation and evolution of crystal mosaicity during Bridgman solidification of single crystal Ni-based superalloys of CMSX-4 type. In general, mosaicity is a measure of the spread of crystal plane orientations. A mosaic superalloy single crystal is typically characterized by the presence of small subgrains with misorientations up to a few degrees. We show that crystal mosaicity is caused by dendrite deformation processes. We use a new tomographic serial sectioning technique, where neuronal network based machine learning processes are employed to detect and to trace growth paths of more than 3000 individual dendrites in large sample volumes. We use this technique to study how dendrite branching events and the interaction between individual slightly misaligned dendrites and their environment govern the evolutions of microstructures and thus single crystal quality.