Abstract
The present study is aimed at understanding the interface kinetics during solute driven remelting in metallic alloys. Solid Al is placed in contact with a liquid Al-Mg alloy. As solid and liquid compositions at the interface are out of equilibrium, remelting takes place. The remelting rate is estimated as a function of time using a simple heat balance. The estimated velocity from the heat-balance calculations shows excellent agreement with the geometric velocity, directly measured from the remelted samples in each experiment. This confirms the accuracy and reliability of the heat-balance calculations and establishes this technique as a potential method for tracing the interface velocity during remelting. The results indicate that, at a constant temperature, an increase in liquid supersaturation leads to a linear increase in remelting velocity, as a result of an increasing driving force for remelting. At a constant liquid supersaturation, an increase in temperature results in an exponential increase in the remelting velocity, due to the enhanced mass transport at the higher temperatures. Semi-empirical relations are derived from these experimental observations and a combined analysis of the effects of driving force and kinetics yields a relation for remelting velocity as a function of temperature for a variety of boundary conditions. Remelting velocities predicted by this relation are in good agreement with the experimental observations.
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Dutta, B., Rettenmayr, M. An experimental investigation on the kinetics of solute driven remelting. Metall Mater Trans A 31, 2713–2720 (2000). https://doi.org/10.1007/BF02830330
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DOI: https://doi.org/10.1007/BF02830330