Multi-principal-element high-entropy alloy extends the composition design to the deep regions of the multicomponent phase diagram

which has no clear difference between solvent and solute. Therefore

these alloys have a more complex composition

unique atom structure and high mixing entropy and manifest lots of distinctive properties

determining that the solidification behavior of the multi-principal element high entropy alloy is different from that of the traditional alloy

especially in aspects of solute redistribution

solidification microstructure formation and grain refinement methods. Based on the complex compositions of multi-principal-element high entropy alloys

the solidification structure

composition segregation and methods of grain refinement of some typical systems were mainly reviewed

and the future research on solidification behaviors and microstructure control was prospected.