THERMODYNAMIC PARAMETERS OF LIQUID TERNARY FE-1-X(NI5 6CR1/6)(X) ALLOYS/

Computer-aided Knudsen cell mass spectrometry is used for thermodynami c investigations on liquid ternary Fe-1-x(Ni5/6Cr1/6)(x) alloys. The t hermodynamic excess properties have been determined by means of the Di gital Intensity-Ratio (DIR) method. Liquid ternary Fe-1-x(Ni5/6Cr1/6)( x) alloys are characterized by exothermic molar heats of mixing H-E, n egative molar excess Gibbs energiesG(E), and negative molar excess ent ropies S-E. At 1850 K, the minimum H-E value is - 3120 J/mol (42.3 at. % Fe), the minimum G(E) value is - 2540 J/mol (30 at.% Fe), and the mi nimum S-E value is - 0.44 J/(mol 8) (60 at. % Fe). At 1850 K, the ther modynamic activities of Fe show slight negative deviations from the id eal behaviour for alloys with a Fe-content ofless than 75 at.%, and id eal behaviour for the Fe-rich alloys (X(Fe) > 0.75).