Abstract
The compositions were determined of alloy and sulfide phases in the Fe‐Al‐S system equilibrated with one another at 1173 K. These evaluations were used to construct the ternary Fe‐Al‐S isotherm, which was comprised of three sulfide phases coexisting with alloy: containing up to 0.61 atomic percent (a/o) Al, of Fe/Al ratio 0.766 to 0.518 in the alloy composition range 0.84 to 5.86 a/o Al, and containing 0.30 a/o Fe. These results were combined with available thermodynamic data to determine the ternary equilibrium diagram in the form of sulfur activity vs. aluminum metal atom fraction of the alloy and sulfide phases. The sulfur activity over the ternary univariant coexistence is .
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