The modified quasichemical model for short-range ordering has been used to
predict the thermodynamic properties of liquid Fe-Co-S, Ni-Co-S, and Fe-Ni-
S solutions based only upon parameters obtained from critical optimization
of data for the corresponding metal-sulfur and metal-metal binary systems.
Calculated equilibrium sulfur pressures over the ternary solutions and calc
ulated tie-lines between the ternary solutions and the solid alloy phases a
gree with measurements, within experimental error limits, over a wide range
of compositions and temperatures.