  Solidification is an important process in many alloy processing routes. The
solidified microstructure of alloys is usually made up of dendrites, eutectics
or a combination of both. The evolving morphologies are largely determined by
the solidification process and thus many materials properties are dependent on
the processing conditions. While the growth of either type of microstructure is
well-investigated, there is little information on the coupled growth of both
microstructures. This work aims to close this gap by formulating a phase-field
model capable of reproducing dendritic, eutectic as well as dendritic-eutectic
growth. Following this, two-dimensional simulations are conducted which show
all three types of microstructures depending on the composition and processing
conditions. The effect of the dendritic-eutectic growth on the microstructural
lengths, which determine materials properties, is investigated and the
morphological hysteresis between eutectic growth and dendritic-eutectic growth
is studied by employing solidification velocity jumps. Further, the influence
of primary crystallization is investigated in large-scale two-dimensional
simulations. Finally, qualitative three-dimensional simulations are conducted
to test for morphological changes in the eutectic.
