DOI: 10.15330/pcss.16.1.20-27

A. Shirinyan

On the Role of Mesoentropy in Thermodynamics of First Order Phase Transformations in Alloys

“Physical-chemical materials science” center of Kyiv National University and National Academy of Sciences of Ukraine, Physics Faculty, Kyiv Taras Shevchenko National University, vul. Volodymyrska 61, 01601, Kyiv, Ukraine, aramshirinyan@ukr.net

A thermodynamics of a new phase formation in a binary alloy, taking into account the chemical depletion and the size distribution of new phase nuclei giving the energy input at high temperatures, is considered. It is shown the principal possibility of obtaining of the size distribution function for nuclei in the framework of a general variation procedure for the Gibbs free energy functional. The ‘chemical depletion’ related to the difference of compositions of the new phase embryo and the solution of the solid metastable alloy is discussed. The role of the ‘mesoentropy’ for the determination of whole energy of first order phase transformation is manifested.
Keywords: new phase embryo, Gibbs potential, chemical depletion, mesoentropy, size distribution, nucleation sites, variational procedure.

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