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|To understanding of slow and non-monotonic relaxation in Al–Y eutectic melts
|Vasin, M. G.
Lebedev, V. G.
|Vasin M. G. To understanding of slow and non-monotonic relaxation in Al–Y eutectic melts / M. G. Vasin, V. G. Lebedev. — DOI 10.1016/j.jnoncrysol.2020.120131 // Journal of Non-Crystalline Solids. — 2020. — Vol. 543. — 120131.
|We discuss the nature of slow relaxation processes in glass-forming eutectic melts right after melting. For specific, we focus on the binary metallic melt Al–Y, which in addition to the slow relaxation shows unusual non-monotonic dynamics. We argue this slow dynamic the result of non-linearity of diffusion processes in the initially non-homogenous sample, and the nature of slow relaxation processes in eutectic melts after melting is similar to the nature of spinodal decomposition when the reason for the slowdown is the thermodynamic instability. To support this assertion we considered the model with combined Gibbs potential of the Al-Y liquid solution, in which the presence of the stoichiometric phase remains is taken into account. We show that in this system the instability mathematically described by the Cahn–Hilliard type equation can develop, and that fluctuation accounting in the considered model allows qualitatively describe the non-monotonic relaxation observed in the Al-based non-equilibrium melts. © 2020 Elsevier B.V.
METALS AND ALLOYS
|The work was supported by the Russian Foundation for Basic Research , Grants 18-02-00643 (MV) and 18-42-180002 (VL). Part of the work was carried out within the framework of the state assignment of the Ministry of Education and Science of Russia (no. AAAA-A17-117022250039-4 ).
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