Kazım Keşlioğlu

Solid–liquid interfacial energy of aminomethylpropanediol

The grain boundary groove shapes for equilibrated solid aminomethylpropanediol, 2-amino-2 methyl-1.3 propanediol (AMPD) with its melt were directly observed by using a horizontal temperature gradient stage. From the observed grain boundary groove shapes, the Gibbs?Thomson coefficient (?), solid?liquid interfacial energy (?SL) and grain boundary energy (?gb) of AMPD have been determined to be (5.4 ? 0.5) ? 10?8?K?m, (8.5 ? 1.3) ? 10?3?J?m?2 and (16.5 ? 2.8) ? 10?3?J?m?2, respectively. The ratio of thermal conductivity of equilibrated liquid phase to solid phase for the AMPD has also been measured to be 1.12 at the melting temperature.

Dependence of microstructure, microhardness, tensile strength and electrical resistivity on growth rates for directionally solidified Zn-Al-Sb eutectic alloy

Abstract Zn-5.3 wt.% Al-0.8 wt.% Sb alloy was directionally solidified upward at a constant temperature gradient (G = 2.39 K mm−1) with a wide range of growth rates (V) (9.70 – 2 013.40 μm s−1) by using a Bridgman type directional solidification furnace. The average values of eutectic spacing (λ), microhardness (HVT), ultimate tensile strength (σUTS) and electrical resistivity (ρ) were measured from transverse sections of the directionally solidified samples. The dependency of λ, HVT, σUTS and ρ on V were experimentally obtained by using linear regression analysis for low, high and all growth rates. The bulk growth rates were also determined by using the measured values of λ and V for low, high and all growth rates. The results obtained in the present work were compared with the Jackson–Hunt eutectic theory and similar experimental results in the literature. Also, the specific heat difference (ΔCP) and enthalpy of fusion (ΔH) for the Zn–Al–Sb alloy were determined by means of differential scanning calorimetry.

Thermal Conductivity of Solid Phases for Naphtol, Camphene, Salol, and Bezil

Dependencies of thermal conductivity of solid phases on temperature have been investigated by using radial heat flow apparatus for naphthol, camphene, salol, and benzil. From graphs of the solid phase’s thermal conductivity variations versus temperature, the thermal conductivities of the solid phases for naphthol, camphene, salol, and benzil have been determined at their melting temperatures. The ratios of thermal conductivity of the liquid phase to thermal conductivity of the solid phase for naphthol, camphene, salol, and benzil have also been determined with a Bridgman-type directional solidification apparatus at their melting temperatures.