Materials Research and Technology

Biography

Biography: Alex guskov

Abstract

Motivation Research: Explanation and prediction of the distribution of components in the crystallization solutions causes great difficulties. One reason for this is the assumption that during crystallization the solution is in the metastable state. The decomposition of the solution occurs by binodal scenario in this case.

Aim: The purpose of this study is to show that in many cases the solution during crystallization is in an unstable state. The unstable condition leads to decomposition of the solution by spinodal scenario.

Methodology & Theoretical Orientation: Experimental demonstration of spinodal decomposition of the solution is conducted by means of video shooting. Locally configuration thermodynamic model is used to explain the state changes of the solution during the phase transition. This model allowed adding additional coordinate - mixing energy in the equilibrium phase diagram. Boundary of the spinodal area of the solution is built into the new coordinates. Spinodal defines curve the dynamic equilibrium that must be considered in the calculations of the processes of interphase mass transfer.

Findings: The possibility of spinodal decomposition of the solution during its crystallization significantly alters the representation of interphase mass transfer. Many cases of the redistribution component during the phase transition cannot be explained without taking into account of spinodal decomposition.

Conclusion & Significance: Spinodal decomposition of the solution explains the process of formation of a periodic distribution of the eutectic composites. The layer of the unstable solution is localized in front of the unstable interface. The unstable solution decomposes into phases have a composition close to the eutectic composition of the solid phases. The period of alternation of these phases is set by the period of instability of the interface. Experiments show that the formation of dendrites in the two-phase zone and extremum of the component concentration close to interface also occurs in the spinodal decomposition scenario.

Recent Publications

1. Guskov A.P. (2016) The decomposition of the solution during the formation of eutectic composites. COMPOSITES and NANOSTRUCTURES, Volume 8, N3, pp. 2-15. (in Russian)
2. Alex Guskov, (2014) On Linear Analysis of the Movement of the Interface under Directed Crystallization. Advances in Chemical Engineering and Science, 4, 103-119.
3. A. P. Guskov, L. P. Nekrasova, A. S. Gornakova, and I. A. Shikunova (2014) Crystallochemiluminescence of Solutions Crystallography Reports, Vol. 59, No. 5, pp. 758–761.
4. A. Guskov, L. Nekrasova. (2013) Decomposition of Solutions in Front of the Interface Induced by Directional Crystallization. Journal of Crystallization Process and Technology. 3, 170 - 174.
5. Guskov A.P., Nekrasova L.P., Ershov A.E., Kogtenkova O.A. (2013) The decomposition of the solution in the interface under directional solidification. Materilovedenie - Materials Science, No. 10, pp. 10-15 (in Russian).
6. A.Guskov, (2012) Qualitative Analysis of Interface Behavior under First Order Phase Transition. Journal of Crystallization Process and Technology, 2, pp. 25-29.
7. A. P. Guskov (2009) The period of decay of a nonequilibrium solution at the directed crystallization. Materials Science  No 10, p. 9-13 (in Russian).
8. A.Gus’kov, A.Orlov (2009) Influence of an interphase nonequilibrium solution layer on formation eutectic pattern. Materials Science  No 12, p. 2-6 (in Russian).