Thermodynamic modeling of the Al-Cr-Ni system over the entire composition and temperature range

A thermodynamic reassessment of the entire Al-Cr-Ni system has been made, according to the CALPHAD method. Compared to the previous assessments, more recent experimental results have been considered: in the binary subsystems Cr4Al11, CrNi2 and Ni3Al4 have been added and the model of the γ-L phase (hR26 –Cr5Al8 type) has been modified to four sublattices. The order-disorder model has been used to describe the A2/B2 and A1/L12 phase relations, respectively. Three ternary compounds in the Al-rich region have been introduced for the first time. Thermodynamic interaction parameters have been optimized using all the available experimental data. On the basis of the thermodynamic database implemented in this work stable isothermal and vertical sections have been calculated, which can fit experimental results in the whole composition range, including the aluminum-rich part of the system.