THERMODYNAMIC INVESTIGATION OF THE LIQUID-IRON - NICKEL - TITANIUM-ALLOYS

The mixing enthalpies of liquid Fe-Ni-Ti alloys have been estimated with different interpolation algorithms. The results of the estimations have been compared with the results of the experimental determinations with the aid of a high-temperature calorimeter at 1600-degrees-C. The DELTA-H data have been fitted according to the least squares method by a modified power series and the confidence limit of DELTA-H has been given for 95 % probability. The results of the calculations have shown that the Hillert-2 model is most suitable for the Fe-Ni-Ti system. For this reason, the mixing enthalpies of liquid Fe-Ni-Ti alloys have been estimated in the whole concentration range using Hillert-2 geometry. Beyond the concentration range of experimental determination the results of the calculation could be taken as a good approximation.