Abstract
Thermodynamic excess functions of Co-Cr alloys in the liquid phase have been investigated by Knudsen-cell mass spectrometry in the concentration range 0.272-0.605 atomic fraction (at. fr.) of Cr in the temperature range 1710-1860 K. The molar excess Gibbs energies, entropies, and enthalpies as well as the thermodynamic activities of components in the Co-Cr system were obtained using composition and temperature dependence of the ratio of intensities of ⁵⁹Co and ⁵²Cr ions. The results show that subregular solution model would fit the measured data well: (2-parameter thermodynamically adapted power (TAP) series: C^H_n in J/mol: C^H₁ = -18400, C^H₂ = 13000, C^S_n in J/(mol.K): C^S₁ = -2.5, C^S₂ = 0.2.

Key words
mass spectrometry, metals, thermodynamics, cobalt, chromium

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