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Thermo-electrical properties in Pb-Sb hypereutectic alloy
(KOREAN INST METALS MATERIALS, 2013) Sahin, M.; Cadirli, E.; Surme, Y.; Ozkir, D.
Pb-17 wt% Sb hypereutectic alloy was directionally solidified upward with three different growth rates (8 mu m/s, 18 mu m/s, 42 mu m/s, 166 mu m/s and 497 mu m/s) at a constant temperature gradient (3.6 K/mm) in the Bridgman-type growth apparatus. The dependence of characteristic microstructure parameters such as primary dendrite arm spacing (lambda(1)) and secondary dendrite arm spacing (lambda(2)) on the growth rate (V) were determined by using a linear regression analysis. Variations of electrical resistivity (rho) for cast samples for temperatures in the range of 300-550 K were measured by using a standard dc four-point probe technique. The variations of thermal conductivity with temperature for the same alloys were determined from the WiedemannFranz and SmithPalmer equations by using the measured values of electrical resistivity. The enthalpy of fusion for the same alloys were determined by means of a differential scanning calorimeter from a heating trace during the transformation from solid to liquid. The corrosion resistance was analyzed by Tafel extrapolation and linear polarization resistance methods conducted in a 5% sodium chloride solution in contact with air maintained at room temperature. Effects of the growth rate on the electrical resistivity and corrosion resistance were also investigated.