Journal of Physical Studies 12(3), Article 3705 [5 pages] (2008) DOI: https://doi.org/10.30970/jps.12.3705 THEORETICAL STUDIES OF THE PHASE STRATIFICATION PROCESS IN AMORPHOUS BINARY ALLOYS V. I. Lysov, T. L. Tsaregradskya, O. V. Turkov, G. V. Saenko, V. V. Yarysh Kyiv Taras Shevchenko National University, 64, Volodymyrska St., Kyiv, 01033, Ukraine

The processes of phase formations in amorphous alloys of systems Fe-Zr and Ni-Zr are considered. There is offered a new expression for the description of concentration dependence of relative free Gibbs energy for the initial amorphous phase which takes into account the dependence of entropy on the volume change at the alloy formation. Concentration dependences of free Gibbs energy for the initial amorphous phase, for amorphous phases which occur during phase stratification and crystal phases which are allocated at the further phase formations are constructed. The constructed concentration dependences of the relative integral free Gibbs energy for the initial amorphous phase have a specific $S$-like shape, which shows the tendency of the studied alloys to stratification. Volumetric parts of new phases for the Fe$_{90}$Zr$_{10}$ and Ni$_{64}$Zr$_{36}$ alloys are designed within the framework of the modified theory of homogeneous nucleation for binary alloys. It is shown that the offered equations qualitatively truly describe the process of phase stratification and further growth in their crystal phases that is some coordination of the results of theoretical calculations with the experiment is observed.

PACS number(s): 74.70.Ad, 64.75.+g

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