Thermodynamic parameters of liquid ternary Fe1−x(Ni5/6Cr1/6)xalloys

摘要

Computer-aidedKnudsencell mass spectrometry is used for thermodynamic investigations on liquid ternary Fe1−x(Ni5/6Cr1/6)xalloys. The thermodynamic excess properties have been determined by means of the Digital Intensity-Ratio (DIR) method. Liquid ternary Fe1−x(Ni5/6Cr1/6)xalloys are characterized by exothermic molar heats of mixingHE, negative molar excessGibbsenergiesGE, and negative molar excess entropiesSE. At 1850 K, the minimumHEvalue is −3120 J/mol (42.3 at. Fe), the minimumGEvalue is −2540 J/mol (30 at. Fe), and the minimumSEvalue is −0.44 J/(mol K) (60 at. Fe). At 1850 K, the thermodynamic activities of Fe show slight negative deviations from the ideal behaviour for alloys with a Fe-content of less than 75 at., and ideal behaviour for the Fe-rich alloys (