Yazar "Meydaneri, Fatma" seçeneğine göre listele

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    Determination of thermal conductivities of Sn-Zn lead-free solder alloys with radial heat flow and Bridgman-type apparatus
    (Springer, 2013) Meydaneri, Fatma; Saatci, Buket; Gunduz, Mehmet; Ozdemir, Mehmet
    The variations of thermal conductivities of solid phases versus temperature for pure Sn, pure Zn and Sn-9 wt.% Zn, Sn-14 wt.% Zn, Sn-50 wt.% Zn, Sn-80 wt.% Zn binary alloys were measured with a radial heat flow apparatus. The thermal conductivity ratios of liquid phase to solid phase for the pure Sn, pure Zn and eutectic Sn-9 wt.% Zn alloy at their melting temperature are found with a Bridgman-type directional solidification apparatus. Thus, the thermal conductivities of liquid phases for pure Sn, pure Zn and eutectic Sn-9 wt.% Zn binary alloy at their melting temperature were evaluated by using the values of solid phase thermal conductivities and the thermal conductivity ratios of liquid phase to solid phase.
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    Determination of Thermal Conductivities of Solid and Liquid Phases for Rich-Sn Compositions of Sn-Mg Alloy
    (Korean Inst Metals Materials, 2012) Meydaneri, Fatma; Gunduz, Mehmet; Ozdemir, Mehmet; Saatci, Buket
    The variations of thermal conductivities of solid phases versus temperature for pure Sn and Sn-1 wt% Mg, Sn-2 wt% Mg, and Sn-6 wt% Mg binary alloys were measured with a radial heat flow apparatus. Thermal conductivity variations versus temperature for pure Sn and Sn-1 wt% Mg, Sn-2 wt% Mg, and Sn-6 wt% Mg binary alloys were found to be 60.60 +/- 3.63, 61.99 +/- 3.71, 68.29 +/- 4.09, and 82.04 +/- 4.92 W/Km, respectively. The thermal conductivity ratios of liquid phase to solid phase for pure Sn and eutectic Sn-2 wt% Mg alloy at their melting temperature were found to be 1.11 and 1.08, respectively, with a Bridgman type directional solidification apparatus. Thus the thermal conductivities of liquid phases for pure Sn and eutectic Sn-2 wt% Mg binary alloy at their melting temperature were evaluated to be 67.26 +/- 4.03 and 73.75 +/- 4.42 W/Km, respectively, by using the values of solid phase thermal conductivities and the thermal conductivity ratios of the liquid phase to the solid phase.
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    Experimental Determination of Interfacial Energy for Solid Zn Solution in the Sn-Zn Eutectic System
    (Korean Inst Metals Materials, 2012) Meydaneri, Fatma; Payveren, Mehtap; Saatci, Buket; Ozdemir, Mehmet; Marasli, Necmettin
    The grain boundary groove shapes for Zn solid solution in equilibrium with Sn-Zn eutectic liquid were observed with a radial heat flow apparatus. From the observed grain boundary groove shapes, the Gibbs-Thomson coefficient, the solid-liquid and the grain boundary energy for the Zn solid solution in equilibrium with Sn-Zn eutectic liquid were determined to be (2.32 +/- 0.13)x10(-8) Km, (120.87 +/- 13.29)x10(-3) J.m(-2) and (194.76 +/- 23.37)x10(-3) J.m(-2), respectively. The termal conductivity of the eutectic Sn- 9 wt% Zn solid solution, kappa(S), was obtained as 74.74 W/Km by using a radial heat flow apparatus. The thermal conductivity ratio of the eutectic liquid to the eutectic solid, R = kappa(L)/kappa(S) was found to be 0.58 with a Bridgman-type directional growth apparatus. Thus, the value of the thermal conductivity of eutectic Sn-9 wt% Zn liquid solution, kappa(L), was obtained as 43.82 W/Km.
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    Experimental determination of solid-liquid interfacial energy for solid Sn in the Sn-Mg system
    (Elsevier, 2011) Meydaneri, Fatma; Saatci, Buket; Ozdemir, Mehmet
    The equilibrated grain boundary groove shapes for solid Sn in equilibrium with the Sn-9 at.% Mg eutectic liquid were directly observed annealing a sample at the eutectic temperature for about 5 days with a radial heat flow apparatus. The thermal conductivities of the solid phase, kappa(S), and the liquid phase, kappa(L), for the groove shapes were measured. From the observed grain boundary groove shapes, the Gibbs-Thomson coefficient, the solid-liquid interfacial energy and grain boundary energy for solid Sn in equilibrium with the Sn-9 at.% Mg eutectic liquid have been determined to be (7.35 +/- 0.36) x 10(-8) Km, (136.41 +/- 13.64) x 10(-3) Jm(-2) and (230.95 +/- 25.40) x 10(-3) Jm(-2), respectively. (C) 2011 Elsevier B. V. All rights reserved.
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    Thermal conductivities of solid and liquid phases for pure Al, pure Sn and their binary alloys
    (Elsevier, 2010) Meydaneri, Fatma; Saatci, Buket; Ozdemir, Mehmet
    The variations of thermal conductivities of solid phases versus temperature for pure Sn, pure Al and Sn-0.5 wt.% Al, Sn-2.2 wt.% Al, Sn-25 wt.% Al, Sn-50 wt.% Al, Sn-75 wt.% Al binary alloys were measured with a radial heat flow apparatus. From thermal conductivity variations versus temperature, the thermal conductivities of the solid phases at their melting temperature and temperature coefficients for same materials were also found to be 60.60 +/- 0.06. 208.80 +/- 0.22, 69.70 +/- 0.07, 80.30 +/- 0.08, 112.30 +/- 0.12, 142.00 +/- 0.15, 188.50 +/- 0.20 W/K m and 0.00098, 0.00062, 0.00127, 0.00114, 0.00112, 0.00150, 0.00116 K-1, respectively. The thermal conductivity ratios of liquid phase to solid phase for the pure Sn, pure Al and eutectic Sn-0.5 wt.% Al alloy at their melting temperature are found to be 1.11, 1.13, 1.06 with a Bridgman type directional solidification apparatus, respectively. Thus the thermal conductivities of liquid phases for pure Sn, pure Al and eutectic Sn-0.5 wt.% Al binary alloy at their melting temperature were evaluated to be 67.26, 235.94 and 73.88 W/K m, respectively by using the values of solid phase thermal conductivities and the thermal conductivity ratios of liquid phase to solid phase. (C) 2010 Elsevier B.V. All rights reserved.
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    Thermal Conductivity of Solid and Liquid Phases for Pb-Cd Alloys
    (Amer Inst Aeronautics Astronautics, 2013) Meydaneri, Fatma; Saatci, Buket
    Thermal conductivities of solid phases for pure Pb and Pb-x weight % Cd (5, 12, 17.4, 50, and 95) binary alloys were measured with a radial heat flow apparatus. Thermal conductivity depending on temperature and composition for pure Pb and Pb-x weight % Cd (5, 12, 17.4, 50, and 95) binary alloys were obtained to be 32.4 +/- 2.2, 33.4 +/- 2.2, 41.2 +/- 2.8, 37.2 +/- 4.8, 49.2 +/- 3.3, and 84.6 +/- 5.7 W/Km. The thermal conductivity ratio of liquid phase to solid phase for the eutectic Pb-17.4 weight % Cd alloy at its melting temperature is found to be 1.31 with a Bridgman-type directional solidification apparatus. Thus, the thermal conductivity of the liquid phase for the eutectic alloy at its melting temperature was found to be 48.7 +/- 3.3 W/Km by using the values of solid phase thermal conductivity and the thermal conductivity ratio of liquid phase to solid phase.
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    Thermal, Electrical, Microstructure and Microhardness Properties of the Eutectic Magnesium-Tin
    (Springer Heidelberg, 2014) Meydaneri, Fatma; Saatci, Buket
    The variation of thermal conductivity with temperature for Sn-2.0 wt.% Mg eutectic alloy was measured to be 68.29 +/- 4.09 W/Km with a radial heat flow apparatus. The electrical conductivities of the sample were calculated theWiedemann-Franz-Lorenz law, Smith-Palmer equation, Bungardt-Kallenbach and Powell empirical correlations by using the thermal conductivity value, respectively. The values of enthalpy of fusion (Delta H) and the change of specific heat capacity (Delta C-p) were also obtained by differential scanning calorimeter (DSC), respectively. The microhardness value for the alloywas measured byVickersmicrohardness device. The microstructure and composition of the alloy was investigated by using SEM and EDX analysis. According to the results, the defectswhich depending on composition and temperature could increase the electrical resistivity.