Solidification of the Eutectic Alloy in the Gallium–Indium System
RUSSIAN METALLURGY(2021)
Abstract
The influence of the overheating of the Ga–14.2 mol % In eutectic alloy melt on the presolidification cooling is studied on 2-g samples by cyclic thermal analysis. In the case of the overheating of the liquid eutectic above the eutectic temperature T e = 288.3 by 28–30 K and subsequent cooling, the overheating dependence of the supercooling has a continuously increasing character. The limiting supercooling is ~25 K regardless of the preliminary overheating of the melt, from 30 to 100 K. The solidification from the supercooled state is found to have an “explosive” character at a rate of 40–45 K/s. The supercooling is not affected by long-term (for several hours) isothermal holding of the melt in overheated and supercooled states. The kinetic and thermodynamic parameters of the eutectic solidification are calculated using fusibility thermograms.
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Key words
gallium, indium, eutectic alloy, thermal analysis, overheating, presolidification supercooling, limiting supercooling, activity, activity coefficient, activation energy
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