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Emin Çadırlı 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.3
Al(100-x)-Cux alloys (x=3 wt%, 6 wt%, 15 wt%, 24 wt% and 33 wt%) were prepared using metals of 99.99%high purity in vacuum atmosphere. These alloys were directionally solidified under steady-state conditions by using a Bridgman-type directional solidification furnace. Solidification parameters (G, V and ),microstructure parameters (λ1, λ2 and λE) and mechanical properties (HV, σ) of the Al-Cu alloys were measured. Microstructure parameters were expressed as functions of solidification parameters by using a linear regression analysis. The dependency of HV, σ on the cooling rate, microstructure parameters and composition were determined. According to experimental results, the microhardness and ultimate tensile strength of the solidified samples was increased by increasing the cooling rate and Cu content, but decreased with increasing microstructure parameters. The microscopic fracture surfaces of the different samples were observed using scanning electron microscopy. Fractographic analysis of the tensile fracture surfaces showed that the type of fracture significantly changed from ductile to brittle depending on the composition.
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Thermo-Electrical Properties in Pb-Sb Hypereutectic Alloy
M. ¸Sahin,E. Çadırlı,Y. Sürme,D. Özkır 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.3
Pb-17 wt% Sb hypereutectic alloy was directionally solidified upward with three different growth rates (8μm/s, 18 μm/s, 42 μm/s, 166 μm/s and 497 μm/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 (λ1) and secondary dendrite arm spacing (λ2) on the growth rate (V) were determined by using a linear regression analysis. Variations of electrical resistivity (ρ) 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.
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U. Böyük,N. Maraşlı,E. Çadırlı,H. Kaya,K. Keşlioğlu 한국물리학회 2012 Current Applied Physics Vol.12 No.1
AleCueAg eutectic alloy was directionally solidified upwards with different growth rates (1.83e 498.25 mm/s) at a constant temperature gradient (8.79 K/mm) and with different temperature gradients (3.99e8.79 K/mm) at a constant growth rate (8.30 mm/s) by using a Bridgman type directional solidification apparatus. The dependence of microhardness (HV) on the growth rate (V), temperature gradient (G) and microstructure parameter (l) were found to be HV ¼ k1 V0.10, HV ¼ k2 G0.13 and HV ¼ k3 l 0.22, respectively. The electrical resistivity of the AleCueAg eutectic cast alloy increases linearly with the temperature in the range of 300e780 K. The enthalpy of fusion and specific heat change during melting for same alloy were also determined to be 223.8 J/g, and 0.433 J/g K, respectively by a differential scanning calorimeter from heating curve during the transformation from eutectic solid to eutectic liquid.
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