Solution calorimetry operated with liquid Al bath has been used for determination of enthalpies of formation of intermetallic compounds of the Ni-Ti system needed for extensive studies on quaternary system Al-Fe-Ni-Ti within COST 535 program on advanced aluminates. At first, there were obtained enthalpies of solution of Ni, Ti and Fe in liquid Al amounting respectively: -150 ±0.4 kJ/g.atom for Ni, -128.8 ±0.7 kJ/g.atom for Ti and-120.0 ±0.6 kJ/g.atom for Fe. Using these values of enthalpies of solution, the following values of enthalpies of formation were obtained: -25.3 ± 1.7 kJ./mol of atoms for NiTi₂, -31.1 ± kJ/mol of atoms for NiTi and -43.8 ± 1.6 kJ/mol of atoms for Ni₃ Ti, respectively. The resulting values are in good agreement with literature data, both experimental and from ab initio calculations.

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