  Investigating the grain boundary energies of pure fcc metals and their
surface energies obtained from ab initio modeling, we introduce a robust method
to estimate the grain boundary energies for complex multicomponent alloys. The
input parameter is the surface energy of the alloy, which can easily be
accessed by modern ab initio calculations based on density functional theory.
The method is demonstrated in the case of paramagnetic Fe-Cr-Ni alloys for
which reliable grain boundary data is available.
