Thermodynamic Properties of Ni–Hf Alloys

 
N.V.Podoprigora,
 
M.O.Shevchenko
 

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, 2010, #07/08
http://www.materials.kiev.ua/article/1609

Abstract

Isoperibolic calorimetry is used to determine the integral and partial mixing enthalpies of Ni–Hf melts 1770 ± 5 K. It is revealed that Ni–Hf melts form producing a great amount of heat. Temperature dependence of mixing enthalpies for binary Ni–Hf melts is established. Activities of the melt components are determined from coordinates of the liquidus lines in the phase diagram of this system. The calculated and experimental activities of the Ni–Hf system components agree well. These data and the mixing enthalpies are used to calculate the Gibbs energies and mixing entropies of Ni–Hf melts.


CALCULATION OF PHASE DIAGRAM, CALORIMETRY, NICKEL–HAFNIUM, THERMODYNAMIC PROPERTIES OF ALLOYS