Abstract
A consistent thermodynamic description of the process of stationary eutectic solidification at low supercoolings is presented. To find the relation between the parameters that characterize this process, a new approach has been used that is based on obtaining an expression for the rate of the free-energy change by two different methods. This has made it possible to obtain a new relationship between the parameters of the arising structure. The first method is based on the consideration of the free-energy change that is due to the dissipative process of separative diffusion, which occurs in the bulk of the liquid phase. The second method involves the consideration of the balance of changes in the free energy far from the solidification front. Based on various extremum principles, analytical expressions for the rate of solidification and for the parameters of the arising eutectic structure have been derived. Rodlike and lamellar structures, which are observed most often in experiments, have been considered. It has been shown that conditions for the appearance of a particular structure are governed by the minimum values of the surface energy of the interfaces between the solid phases and by the “decomposition structure factor,” which is introduced in this work.
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Original Russian Text © M.A. Ivanov, A.Yu. Naumuk, 2014, published in Fizika Metallov i Metallovedenie, 2014, Vol. 115, No. 5, pp. 502–511.
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Ivanov, M.A., Naumuk, A.Y. Kinetics of eutectic solidification. Phys. Metals Metallogr. 115, 471–480 (2014). https://doi.org/10.1134/S0031918X14050056
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DOI: https://doi.org/10.1134/S0031918X14050056