ENTHALPY OF FORMATION OF BETA-PHASE IN IRON-ALLOYED NICKEL-ALUMINUM SYSTEM

Using the method of calorimetry of dissolution in liquid aluminum, the re have been determined the standard enthalpy of the formation of inte rmetallic (NiAl)(beta) phase alloyed with iron at temperature 298 K De lta H degrees(f.298). For the (Ni0.5Al0.5)beta compound, Delta H degre es(f.298) has been foundd to be equal to -58.0+/-3.0 kT/mole. It has b een established that addition of iron to the (Ni0.5Al0.5)beta compound leads to an increase of Delta H degrees(f.298).