  NiCoCr middle-entropy alloy is known for its exceptional strength at both low
and elevated operating temperatures. Mechanical properties of NiCoCr-based
alloys are affected by certain features of the energy landscape, such as the
energy difference between the hcp and fcc phases (which is known to correlate
with the stacking fault energy in the fcc phase) and curvature of the energy
surface. We compute formation energies in the Ni-Co-Cr ternary and related
quaternary systems and investigate dependences of the relative energies on
composition. Such computed composition-structure-property relations can be
useful for tuning composition and designing next-generation alloys with
improved strength.
