In recent years, High-Entropy Alloys (HEAs), alternatively entitled  ”Compositionally Complex Alloys” etc. have received an enormous research interest due to their expected exceptional properties. In this regard, Co-Cr-Fe-Mn-Ni HEAs, coined as 'Cantor Alloy' is still under enormous investigations in many respects; one exciting research direction is the exploration of influences of Carbon. One crucial effect of Carbon is the change of Thermodynamics and Kinetics of the Cantor alloy so that not only the Interdiffusion of the elements  but also the self-diffusion of those elements vary.

In order to understand these effects, four alloys $(Co,Cr,Fe,Mn,Ni )_{1−X}C_{X}$ {\tiny($X =up~to~0.8~ at .~ %$)} are investigated and the consequent variation of  diffusion phenomena are discussed. The relevant thermodynamics and kinetic properties of the  mentioned alloys are separately described, based on CALPHAD-Type models . Then, a Continuum description combines the thermodynamics and kinetics for simulation of the interdiffusion of matrix elements in the presence of concentration gradients, verified by experiments.