  Eutectic high entropy alloys (EHEAs) are emerging as an exciting new class of
structural alloys as they have shown very promising mechanical properties.
However, how to design these alloys has been a challenge. In this work, a
simple approach is presented for designing EHEAs. The introduced approach uses
the composition of binary and ternary eutectic alloys for finding the
composition of EHEAs. The approach is based on the assumption that EHEAs are
originated from binary and ternary eutectic alloys. The approach is applied for
alloy systems Al-Co-Cr-Fe-Ni, Co-Cr-Fe-Ni, Co-Cr-Fe-Ni-Ti, and Co-Cr-Fe-Ni-Ta
and several EHEAs are predicted for these alloy systems. The predicted results
are verified with thermodynamic simulations and experimental data. The results
show that the introduced approach can be considered as a feasible and
easy-to-use method for designing EHEAs. Based on the developed approach, any
binary eutectic alloy can be used for designing multicomponent eutectic alloys.
