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Description a new phase growth from multicomponent alloy by a decomposition method

A new approach to investigate the growth of a new phase nuclei in multicomponent melt has been developed. The growth processes have been described by the none-equilibrium thermodynamics methods. The interrelation between thermal and diffusion processes in the nuclei and the melt, and the features of mass transfer at the phase boundary were taken into account. A variational approach using the principle of minimum entropy production and the Euler-Lagrange equation [11] has been applied. As the macroscopic parameters of the process, the degree of chemical reactions at the interface, the size and growth rate of the nuclei have been used. The developed approach made it possible, from the general theoretical principles, to obtain simple growth equations for nuclei that are suitable for practical calculations. The growth of spherical nuclei from a multicomponent melt has been considered. The method has been used to describe a metastable crystal growth. The growth of crystals during annealing of amorphous ribbons FINEMET has been considered. Calculations of the growth rate of the nanocrystals formed in the system have been carried out, the influence of the none-equilibrium factors on the growth rate of nuclei in the system Fe73,5Cu1Nb3Si13,5B9 has been investigated.