EXPERIMENTAL INVESTIGATION OF THE TERNARY – NICKEL BASED ALLOYS

This study presents the results of experimental test of the microstructure, hardness and electrical properties of the ternary Ni-based alloys. In the experimental part of the study, alloys of selected compositions were prepared and then examined using scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS), X-ray powder diffraction (XRD), hardness measurements by Brinell method and electrical conductivity measurements. Extrapolated is isothermal section at 25 °C using optimized thermodynamic parameters from literature. The equilibrium phase diagram of the ternary systems was calculated using the Calphad method and the corresponding thermodynamic program (Pandat ver. 8.1). The results include calculated characteristic isothermal sections, structural characteristics, phase composition, mechanical properties and electrical conductivity for investigation ternary systems. Experimentally obtained results were compared with the results of thermodynamic calculation of phase diagrams. Good overall agreement between experimental and calculated values was obtained. Hardness and electrical conductivity properties were predicted in the whole composition range by using appropriated mathematical model. Key words: Microstructure, hardness properties, electrical conductivity, mathematical mode