SOLID-LIQUID INTERFACE ENERGY



Necmettin MARAŞLI

Erciyes University, Faculty of Arts and Sciences, Department of Physics, Kayseri, Turkey
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ABSTRACT


       The solid-liquid interface energy, s SL is defined as the reversible work required to create a unit area of the interface at constant temperature, volume and chemical potentials, and plays a critical role in many phase transformations. The measurements of s SL in pure materials and alloys are difficult. One of the most common techniques for measuring solid-liquid interface energy is the method of grain boundary grooving in a temperature gradient. In this technique, the solid-liquid interface is equilibrated with a grain boundary in a temperature gradient and interface energy is obtained from the measurements of equilibrium shape of the groove profile. This technique has been used to directly measure the solid-liquid interface energy for transparent materials [1-5]. The technique was extended to measure solid-liquid interface energies for opaque materials by Gündüz and Hunt [6]. Gündüz and Hunt [6] developed a numerical method to calculate the Gibbs-Thomson coefficient, G , for a measured grain boundary groove shape. This numerical method calculates the temperature along the interface of a measured grain boundary groove shape rather than attempting to predict the equilibrium grain boundary groove shape. Measurements of the solid-liquid interface energies were made in the Al-Cu, Al-Si, and Pb-Sn eutectic based systems.

Maraşlı and Hunt [7] extended the technique to measure solid-solid interface energies. In addition, they modified experimental apparatus for higher temperature (above 600 oC). They also made measurements in a peritectic system for the first time. They measured solid-solid and solid-liquid interface energies in the Al-CuAl2 and Al-NiAl3 eutectic systems and Al-Ti peritectic system.

Bayender et al [8] designed an apparatus to directly observe equilibrated grain boundary groove shape for transparent materials. They applied Gündüz and Hunt’s numerical method to determine Gibbs-Thomson coefficients, solid-liquid interface energies and grain boundary energies for pivalic acid.

 

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