  In this work, a numerical simulation framework is presented based on the
Phase Field Method that is able to capture the evolution of heterogeneous
metallic microstructures during solidification. The involved physics can prove
especially useful when studying not only systems undergoing thermal gradients,
such as in homogeneous systems, but also in conditions that exhibit stark
spatial gradients, i.e. when these inhomogeneities are present even on a
mesoscopic scale. To illustrate the capabilities of the model, in-situ alloying
of a High Entropy Alloy during Laser Powder Bed Fusion is investigated as an
exemplary use case. The resulting digital twin is expected to shorten
development times of new materials as well as cut down on experimental resource
needs considerably, therefore contributing to efficient material qualification
processes.
