M. O. Shevchenko

THERMODYNAMIC PROPERTIES OF Al-Sc ALLOYS

The mixing enthalpies of liquid Al–Sc binary alloys (0.62 < xSc < 1) are determined by isoperibolic calorimetry at 1840 K. The thermodynamic properties of liquid Al–Sc alloys are described in the entire composition range using the ideal associated solution model. The thermodynamic activities of components in the Al–Sc melts demonstrate large negative deviations from the ideal behavior; the mixing enthalpies are characterized by significant exothermic effects. The minimum mixing enthalpy equals –32.7 ± 2.2 kJ/mol at xSc = 0.49. The experimental and literature data are compared.

Thermodynamic Properties of Binary In–Ni Alloys

The mixing enthalpies of liquid binary In–Ni alloys (0.85 < xNi < 1) at 1800 K were determined by isoperibol calorimetry. The thermodynamic properties of the In–Ni alloys were calculated for the entire composition range using the model of ideal associated solutions. The thermodynamic activities of melt components show negative deviations from the ideal behavior. The mixing enthalpies are characterized by moderate exothermic effects. The minimum mixing enthalpy of the melts is –12.0 ± 0.1 kJ/mol at xNi = 0.59.

Thermodynamic Properties of Binary Al–Pr Alloys

The mixing enthalpies of Al–Pr binary liquid alloys are measured in the ranges 0 < xPr < 0.15 at 1560 K and 0.46 < xPr < 1 at 1410–1670 K by isoperibol calorimetry. The Al–Pr binary melts are characterized by significant negative mixing enthalpies: ΔHAl−Prmin

Thermodynamic Properties of Binary CE–IN Alloys

\varDelta {H}_{Al- \Pr}^{{}^{min}}

Thermodynamic Properties of Co–Pr Alloys

= –43.1 kJ/mol at xPr = 0.33 (at 1500 K, extrapolation onto the range of supercooled melts). The activities of components, entropies, Gibbs energies, and liquidus curve of the Al–Pr phase diagram are evaluated using the model of ideal associated solutions.

THERMODYNAMIC PROPERTIES OF Al-La-Ni MELTS

The mixing enthalpies of liquid binary Eu–In alloys (0 < xIn< 0.66, 0.78 < xIn< 1) are determined by isoperibol calorimetry at 1170–1300 K. The thermodynamic properties of the liquid Eu–In alloys are described in the entire composition range using the model of ideal associated solution. The thermodynamic activities of components in the Eu–In melts demonstrate negative deviations from the ideal behavior, and the mixing enthalpies are characterized by significant exothermic effects. The minimum value of the mixing enthalpy is −35.1 ± 0.5 kJ/mol at xIn= 0.52 (T = 1300 K) and −41.2 ± ± 0.5 kJ/mol at xIn= 0.50 (T = 1170 K).

Thermodynamic Properties of Ce–In–Ni Ternary Alloys

The mixing enthalpies of liquid binary Ce–In alloys (0 < xIn< 1) at 1500 K are determined by isoperibol calorimetry. The thermodynamic properties of the liquid Ce–In alloys are calculated for the entire composition range using the model of ideal associated solutions. The thermodynamic activities of melt components show negative deviations from the ideal behavior. The mixing enthalpies are characterized by significant exothermic effects. The minimum mixing enthalpies of the melts are –43.8 ± 0.2 kJ/mol at xIn= 0.57.

Thermodynamic Properties of Ce–Ni Binary Alloys

The mixing enthalpies of the La–Ni binary liquid alloys are determined by isoperibol calorimetry in the composition range 0 < xNi <0.45 at 1430 K and 0.75 < xNi < 0.80 at 1800 K. The thermodynamic properties of the La–Ni binary liquid alloys are calculated for the entire composition range using the model of ideal associated solutions and reliable published data. The thermodynamic activities of components show negative deviations from the ideal behavior; the mixing enthalpies are characterized by exothermic effects. The minimum mixing enthalpy of the melts is –28.0 ± 0.2 kJ/mol at xNi = 0.6.