PHENOMENA ASSOCIATED WITH THE DIFFUSE PHASE TRANSITION
Taking into account the size effect, the effect of the contributions from the increments of the bulk, surface and radial energy components on the phase formation is investigated, as well as the work of the amorphous matrix to counteract the change in the size of the nucleus. It is shown that the radial energy component and the latent heat of the phase transformation are proportional to the Laplace pressure. It has been found that the growth of supercritical nuclei is hindered by the parent phase due to the implementation of the Tolman effect. The calculation is carried out and the graphs of the difference in the chemical potentials of the elements of the phases and its first derivative with respect to the crystallite radius are plotted for various accompanying phenomena. The dependences demonstrate the diversity of the process of the emergence of a new phase during the diffuse transformation of an amorphous alloy into a crystallite: from the nucleation and growth of formations of particles of small sizes up to the appearance in the alloy of associations with different values of the threshold radius. Kinetic analysis of the crystallization process of an amorphous alloy is carried out with taking into account the free volume. It is shown that the evolution of a disordered medium is determined by the parameters of close packing and order. In the quasi-chemical approach, a logistic model is proposed, in which a nonlinear equation is used to describe the change in the order parameter over time. The common features and differences of the model with Kolmogorov's approach are established.