Experimental and thermodynamic investigation of the Ni-Al-Mo system

The diffusion triple and electron probe microanalysis (EPMA) techniques hav e been adopted to study the isothermal section of the Ni-Al-Mo system at 13 73 K. Experimental data from present work and literature have been assessed to evaluate the thermodynamic parameters of the ternary system by means of the calculation of phase diagram (CALPHAD) method. A substitutional-soluti on model is used to describe liquid, fee, and bcc phases, while a sublattic e model is used to describe intermetallic phases. Two sets of thermodynamic descriptions have been obtained, and comparison has been made between them . Also, calculations of equilibrium-phase diagrams compared to the experime ntal data have been presented. There is good agreement between the calculat ions and the experimental data.