Experimental investigation and thermodynamic calculation of the phase equilibria in the Fe–Ni–V system

• Three isothermal sections of the Fe–Ni–V ternary system at 1000 °C, 1100 °C and 1200 °C were established.
• The σ phase formed continuous solid solutions from the Fe–V side to the Ni–V side.
• Thermodynamic parameters of the Fe–Ni–V system were obtained.
• An agreement between the calculated results and experimental data was obtained.

The phase equilibria in the Fe–Ni–V ternary system were investigated by means of electron probe microanalysis (EPMA) and X-ray diffraction (XRD). Three isothermal sections of the Fe–Ni–V ternary system at 1000 °C, 1100 °C and 1200 °C were established. On the basis of the obtained experimental data, the phase equilibria in the Fe–Ni–V system were thermodynamically assessed using (CALculation of PHAse Diagrams) CALPHAD method, and a consistent set of thermodynamic parameters leading to reasonable agreement between the calculated results and experimental data was obtained.