  In the present work, a simple approach is proposed for predicting the
compositions of eutectic high entropy alloys (EHEAs) in Al-Co-Cr-Fe-Ni system.
It is proposed that eutectic lines exist between certain eutectic alloys in
this system and, as a result, new eutectic or near-eutectic compositions can be
obtained by mixing the alloys which are located on the same eutectic line. The
approach is applied for a series of experimentally verified eutectic alloys and
new eutectic or near-eutectic alloys are designed for Al-Co-Cr-Fe-Ni system.
Furthermore, by investigating the compositions of verified eutectic alloys in
Al-Co-Cr-Fe-Ni system, compositional diagrams are proposed which show the
relations between the concentrations of constituent elements in eutectic
alloys. The compositional diagrams suggest that EHEAs are derived from binary
and ternary eutectic alloys. Moreover, the proposed diagrams can be considered
as convenient methods for evaluating the composition of EHEAs in Al-Co-Cr-Fe-Ni
system.
