  The phase-field method has been established as a de facto standard for
simulating the microstructural evolution of materials. In quantitative modeling
the assessment and compilation of thermodynamic/kinetic data is largely
dominated by the CALPHAD approach, which has produced a large set of
experimentally and computationally generated Gibbs free energy and atomic
mobility data in a standardized format: the thermodynamic database (TDB) file
format. Harnessing this data for the purpose of phase-field modeling is an
ongoing effort encompassing a wide variety of approaches. In this paper, we aim
to directly link CALPHAD data to the phase-field method, without intermediate
fitting or interpolation steps. We introduce a model based on the
Kim-Kim-Suzuki (KKS) approach. This model includes sublattice site fractions
and can directly utilize data from TDB files. Using this approach, we
demonstrate the model on the U-Zr and Mo-Ni-Re systems.
