Thermodynamic assessment of FeMnNbN and NbCNsystems

In the present work the thermodynamic parameters of the FeMnNbN and NbCN systems are assessed with the CALPHAD technique using a computerized optimization procedure (PARROT). ptions for most of the binary and ternary systems are already available so a selection between sets of parameters was made. An additional reassessment was needed for the NbN system with the aim to suppress unexpected appearance of the bcc phase at high pressures. The description of the FeMnNbN and NbCN systems was made as an extrapolation from binary and ternary systems. The obtained set of parameters for the FeMnNbN system was tested against existing experimental data for the niobium nitride solubility.