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Browsing TFBor by Subject "Ag-Ge-Sn system"

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    Effect of chemical composition on the corrosion resistance of the ternary Ag-Ge-Sn alloys
    (University of Belgrade, Technical Faculty in Bor, 2023) Zečević, Milena; Minić, Duško; Đorđević, Aleksandar; Manasijević, Dragan
    In this paper selected system is Ag-Ge-Sn. This system was previously studied by our group. In this paper results are focused on corrosion resistance. Experimental part includes results of the corrosion resistance of the binary alloys Ge50Sn50, Ag50Sn50, Ag50Ge50 and ternary (Ag-Ge-Sn) alloys in 3% NaCl, of the selected ternary Ag-Ge-Sn alloys. The corrosion resistance of these alloys was examined in 3% NaCl solution using the potentiodynamically polarization method (Tafel plots) and electrochemical impedance spectroscopy (EIS). Tafel plots were fitted using the DC Corrosion Technique software. The results of electrochemical impedance spectroscopy (EIS) were fitted using the Gamry Echem Analyst program and the corresponding equivalent circuit. The value of the exponent n was used to determine the degree that controls the rate of the electrochemical reaction. It was investigated how the chemical composition affects corrosion.
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    Mechanical and electrical properties of the ternary Ag-Ge-Sn alloys
    (University of Belgrade, Technical Faculty in Bor, 2023) Đorđević, Aleksandar; Zečević, Milena; Minić, Duško; Manasijević, Dragan
    This study presents the results of experimental and analytical tests. Experimental part includes results of the hardness and electrical properties of the selected ternary Ag-Ge-Sn 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. Analytical part includes, calculations of equilibrium phase diagram of the Ag-Ge-Sn ternary system by using the Calphad method and the corresponding thermodynamic program (Pandat ver. 8.1). The results include calculated characteristic isothermal sections. Isothermal section of the ternary Ag-Ge-Sn system at 25 °C have been extrapolated using optimized thermodynamic parameters from literature. 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 of selected alloys were measured and by using appropriated mathematical model these properties were predicted in the whole composition range.