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Ascertainment of the nature of the slow relaxation processes observed aftermelting in glass-forming eutectic melts is the subject of this work. We claimthat the diffusion processes nonlinearity in heterogeneous melt with inclusionsof refractory stoichiometry is the origin of this phenomenon. The cause forthis nonlinearity is the thermodynamic instability similar to one taking placeat spinodal decomposition, and indispensable condition is the initiallynon-homogenous. For confirmation of our devotes, we consider the model ofliquid solution of a binary system, which evolution described by theCahn-Hilliard equation with combined Gibbs potential assuming the presence ofremains after melting stoichiometric phase. Exemplified by the Al-Y and Al-Yballoys, using Gibbs potentials from a standard database we show that subject toinitial heterogeneity in these systems the instability can develop leading tothe slow relaxation processes, and determine the regions of this instability inthe phase diagrams.

About causes of slow relaxation of melted intermetallic alloys