The Reassessment of the Thermodynamic Description of the B-Fe-V System with Focus on the Ternary Phase

Abstract In the present work, an update of experimental knowledge and the thermodynamic description of the ternary B-Fe-V system was done with a focus on the V 2 FeB 2 ternary phase. For this purpose, several alloys containing the ternary phase were prepared and were investigated after long-term annealing at 600 and 1080 °C by the methods of scanning electron microscopy, x-ray diffraction, and differential thermal analysis. The obtained results and knowledge about the ternary phase were used to improve the description of the boron-iron-vanadium ternary system. A new model for the ternary phase was used. The thermodynamic parameters for the VB, V 3 B 4 , and Fe 2 B borides were also modified. The calculation performed using the new thermodynamic database achieved a very good agreement with the experimental results.