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Thermodynamic Properties of Binary Al–Pr Alloys

M.O.Shevchenko,
 
† V.Berezuckiy,
 
M.Ivanov,
 
V.Sudavtsova
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2016, #01/02
http://www.materials.kiev.ua/article/2150

Abstract

The mixing enthalpies of binary Al–Pr 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 binary Al–Pr melts are characterized by significant negative mixing enthalpies: = –43.1 kJ/mol at xPr = 0.33 (at 1500 K, extrapolation onto the range of undercooled melts). Activities of the components, entropies, Gibbs energies, and liquidus curve of the Al–Pr phase diagram were evaluated using the model of ideal associated solutions.


ALUMINUM, CALORIMETRY, IDEAL ASSOCIATED SOLUTION MODEL, MIXING ENTHALPY, PRASEODYMIUM

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