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- 저자 : U. Böyük (검색결과 6 건)
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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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Interfacial energies of carbon tetrabromide
U. Böyük,N. Maraşlı 한국물리학회 2009 Current Applied Physics Vol.9 No.3
The equilibrated grain boundary groove shapes for solid carbon tetrabromide (CTB) in equilibrium with its melt were directly observed by using a horizontal temperature gradient stage. From the observed grain boundary groove shapes, Gibbs–Thomson coefficient (Γ) and solid–liquid interfacial energy (σSL) and grain boundary energy (σgb) of CTB have been determined to be (7.88 ± 0.8) × 10-8 K m, (6.91 ± 1.04) × 10-3 J m-2 and (13.43 ± 2.28) × 10-3 J m-2, respectively. The ratio of thermal conductivity of equilibrated liquid phase to solid phase for CTB has also been measured to be 0.90 at its melting temperature. The value of σSL for CTB obtained in present work was compared with the values of σSL determined in the previous works for same material and it was seen that the present result is in good agreement with previous works. The equilibrated grain boundary groove shapes for solid carbon tetrabromide (CTB) in equilibrium with its melt were directly observed by using a horizontal temperature gradient stage. From the observed grain boundary groove shapes, Gibbs–Thomson coefficient (Γ) and solid–liquid interfacial energy (σSL) and grain boundary energy (σgb) of CTB have been determined to be (7.88 ± 0.8) × 10-8 K m, (6.91 ± 1.04) × 10-3 J m-2 and (13.43 ± 2.28) × 10-3 J m-2, respectively. The ratio of thermal conductivity of equilibrated liquid phase to solid phase for CTB has also been measured to be 0.90 at its melting temperature. The value of σSL for CTB obtained in present work was compared with the values of σSL determined in the previous works for same material and it was seen that the present result is in good agreement with previous works.
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S. Engin,U. Böyük,N. Maraşlı 한국물리학회 2011 Current Applied Physics Vol.11 No.4
The equilibrated grain boundary groove shapes for a solid Sn in equilibrium with a Sn―Ag―Zn eutectic liquid were observed in a linear temperature gradient by using a Bridgman type directional solidification apparatus. The Gibbs―Thomson coefficient, solideliquid interfacial energy and grain boundary energy for a solid Sn in equilibrium with a Sn―Ag―Zn eutectic liquid were determined to be (8.21 ± 0.7) × 10^-8 Km,(116.2 ± 15.1) × 10^-3 Jm^-2 and (228.1 ± 34.2) × 10^-3 Jm^-2, respectively from observed grain boundary groove shapes. A comparison of present results with the previous experimental and theoretical results for similar solids in equilibrium with the different liquid was also made.
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H. Kaya,U. Böyük,E. Çadlrll,N. Marasll 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.1
Al-7 wt% Ni alloy was directionally solidified upwards with different growth rates, V (8.3-489.5 μm/s) at constant temperature gradient, G (4.2 K/mm) using a Bridgman-type growth apparatus. The dependence of the dendritic microstructures such as primary dendrite arm spacing (λ1) and secondary dendrite arm spacing (λ2) on the growth rate were determined using a linear regression analysis. The present experimental results were also compared with similar previous experimental results. Measurements of microhardness (HV) and electrical resistivity (ρ) of the directionally solidified samples were carried out. The dependence of the microhardness and electrical resistivity on the growth rate (V) was also analyzed. According to these results, it has been found that, for increasing values of V, the values of HV and ρ increase. However, the values of HV and ρ decrease with increasing values of λ1 and λ2.
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E. Çadlrll,U. Böyük,H. Kaya,N. Mara ll 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.2
Sn-Bi-Zn lead free solder alloy was directionally solidified upward at a constant temperature gradient (G=3.99K/mm) with a wide range of growth rates (8.3-478.6 µm/s) and at a constant growth rate (V=8.3 µm/s) with a wide range of temperature gradients (1.78-3.99 K/mm) using a Bridgman type directional solidification furnace. Wavelength-Dispersive X-ray Fluorescence spectrometry and X-ray diffraction were used to identify the compositions and phases in the microstructure. Dependence of eutectic spacings (λ) on the growth rate (V), temperature gradient (G) and cooling rate ( ) were determined using linear regression analysis. From the experimental results, it can be concluded that the values of λ decrease with the increasing the values of V, G and . The value of λ2V was determined using the measured values of λ and V. The results obtained in the present work have been compared with previous results obtained for binary or ternary alloys.
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Y. Koçak,S. Engin,U. Böyük,N. Maraslı 한국물리학회 2013 Current Applied Physics Vol.13 No.3
BiePb alloy at the eutectic composition was unidirectionally solidified upwards with five different growth rates (V ¼ 7.05e113.09 mm/s) at constant temperature gradient (G ¼ 2.18 K/mm) in a Bridgman type directional growth furnace in order to investigate dependency of eutectic spacing (l), minimum undercooling (DT) and microhardness (HV) on the growth rates (V). The values of l and HV were measured from the quenched samples and the minimum undercooling (DT) were determined from the JacksoneHunt eutectic theory. The dependency of eutectic spacings, microhardness and undercooling on growth rate was investigated. According to these results it has been found that the value of l decreases with increasing the value of V and that the values of HV and DT increase for a constant G. The values of l2 V, lDT and DTV0.5 were determined by using the values of l, DT and V. The results obtained in the present work have been compared with those predicted by the JacksoneHunt eutectic theory and with similar experimental results.
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