  A Magnetic Cluster Expansion (MCE) model for ternary face-centered cubic
Fe-Ni-Cr alloys has been developed using DFT data spanning binary and ternary
alloy configurations. Using this MCE model Hamiltonian, we perform Monte Carlo
simulations and explore magnetic structures of alloys over the entire range of
alloy compositions, considering both random and ordered alloy structures. In
random alloys, the removal of magnetic collinearity constraint reduces the
total magnetic moment but does not affect the predicted range of compositions
where the alloys adopt low temperature ferromagnetic configurations. During
alloying of ordered fcc Fe-Ni compounds with Cr, chromium atoms tend to replace
nickel rather than iron atoms. Replacement of Ni by Cr in alloys with high iron
content increases the Curie temperature of the alloys. This can be explained by
strong antiferromagnetic Fe-Cr coupling, similar to that found in bcc Fe-Cr
solutions, where the Curie temperature increase, predicted by simulations as a
function of Cr concentration, is confirmed by experimental observations.
