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Öğe Investigation of the thermo-electrical properties of A707 alloys(Elsevier B.V., 2019) Çadırlı E.; Kaya H.; Büyük U.; Şahin M.; Üstün E.; Gündüz M.In the present work, the thermal conductivity, electrical conductivity, enthalpy of fusion, specific heat capacity and thermal diffusivity of the A707 alloy (Al–4.5 Zn–1.2 Mg–0.15 Cr–0.15 Zr wt.%) have been investigated. Phase identification of the studied alloy was investigated with energy dispersive X-ray analysis and X-ray diffraction techniques. Thermal conductivity of as-cast A707 alloy was measured using Comparison Cut Bar Method in the temperature range of 300–800 K. With the increase of temperature, thermal conductivity decreased gradually in as-cast A707 alloy. The electrical conductivities of the sample were obtained with the Wiedemann–Franz equation by using the measured thermal conductivity values. Thermal conductivity coefficients for the alloy were obtained from the graphs of thermal conductivity versus temperature. The enthalpy of fusion and the specific heat capacity during the transformation were also determined. Thermal diffusivity changes were calculated as a function of temperature through the obtained thermal data. © 2019 Elsevier B.V.Öğe Investigation of the thermoelectrical properties of the Sn91.2-x–Zn8.8–Agx alloys(Springer Netherlands, 2018) Şahin M.; Çadırlı E.; Bayram Ü.; Esener P.A.Sn91.2-x–Zn8.8–Agx alloys (x = 0.15–10.0 wt%) were directionally solidified upwards at a constant G (4.16 K mm-1) and V (41.5 µm s-1) in a Bridgman-type directional solidification furnace. The electrical resistivity (?) measurements of the alloys depending on the temperature were performed using the standard four-point probe method, and the temperature coefficients of the resistivities (?) were calculated. Composition analyses of the alloys were carried out using energy-dispersive X-ray spectroscopy. The enthalpy (?H) and the specific heat (?Cp) values of the alloys were determined by differential scanning calorimetry analysis. The thermal conductivity (K) values were obtained from the Wiedemann–Franz equation. According to the experimental results, electrical resistivities increased up to 3.0 mass% Ag and decreased with further increase in Ag content. Enthalpy and specific heat values decreased with the increasing content of Ag. The results were compared with the previous works for Sn–Zn–Ag alloys. © 2017, Akadémiai Kiadó, Budapest, Hungary.Öğe The effect of the solidification rate on the physical properties of the Sn-Zn eutectic alloy(Elsevier B.V., 2018) Şahin M.; Karakurt F.As-cast Sn-8.8 wt.% Zn eutectic alloy was directionally solidified with a constant temperature gradient (G = 4.16 K/mm) under various solidification rates (V = 8.3–790 µm/s) in a Bridgman-type furnace. The dependence of the microhardness (HV), ultimate tensile strength (?ut), ultimate compressive strength (?uc), and compressive yield strength (?cy) on the solidification rate was determined. The temperature dependency of the electrical resistivity (?) of the sample was investigated, and the temperature coefficient of the resistivity (?) was calculated from ?-? curve. The specific heat (CP) and the enthalpy (?H) were determined by DSC analysis. The thermal conductivity was calculated using the Wiedemann-Franz equation. © 2018 Elsevier B.V.
