Vasily Lutsyk

T-x-y diagrams with primary crystallization fields of low-temperature modifications

The geometric structure of five types of T-x-y diagrams with polymorphic modifications of the components has been investigated. The possibilities of implementing the computer software for solving applied problems (such as the construction and identification of polythermal and isothermal sections, visualization of the results obtained from calculations of the material balance in the form of material balance diagrams and trajectories of variations in phase compositions, and design of two-phase surfaces corresponding to changes of the phase transformation type inside three-phase regions) have been demonstrated using the computer model of a phase diagram with polymorphism of one of the components as an example.

Specific features of the crystallization of melts in systems with a transition from syntectic equilibrium to monotectic equilibrium

A technology has been proposed for implementing the computer design of phase diagrams and their investigation with the kinematic specification of surfaces by using the T-x-y diagram with a monovariant syntectic equilibrium and a solid-phase solubility as an example. The specific features of the crystallization upon transition from syntectic equilibrium to monotectic equilibrium have been considered, and surfaces with a sign reversal of the mass increment and material balance for a three-phase region have been constructed.

Computer model of a T-x-y diagram for a ternary system with monotectic monovariant equilibrium

Computer design with the kinematic specification of nonlinear and ruled surfaces is proposed for a T-x-y diagram of a ternary system with monotectic monovariant equilibrium. The three-dimensional model makes it possible not only to design any iso-or polythermal section but also to solve mass-balance problems associated with computer design of heterogeneous materials.

Quaternary Reciprocal Systems with the Inner Diagonals: Variants of Polyhedration

New algorithm has been offered to divide a concentration complex of reciprocal system for the subsystems. It is based on the relations between the number of complex polyhedron vertexes and resulting number of simplexes. Method is demonstrated on the quaternary systems. It is easy realized in the software, and is very effective in the cases with inner points (compounds) and with the competition of inner diagonals.

Phase trajectories in CaO-Al2O3-SiO2 melts

A technique for constructing a phase diagram of the CaO-Al2O3-SiO2 system on a computer using the kinematic approach to describe surfaces is proposed. The geometric structure of the diagram and its phase regions is described. Crystallization paths are considered for different parts of the diagram.

Heterogeneous Design: Concentration Fields Determination with the Unique Crystallization Schemes and Microstructures

New approach to calculation of microstructure by means of the one-phase regions borders equations is proposed. Projections of all geometrical elements of phase diagram to the concentration simplex divide it to fields with unique crystallization schemes. All crystallization stages for the given concentration field are simulated and as a result the all elements of microstructure is designed and origin of every phase is shown.

Li,Na,Rb,La||F System for Molten Salt Reactor: 3D and 4D Computer Models

A computer model of LiF-KF-LaF3 system as one of the bounding systems of LiFNaFRbFLaF3 system is presented. The phase regions structures, horizontal and vertical sections are analyzed. The computer simulation of T-x-y diagrams can be used as an instrument to solve different applied tasks for molten salt reactor application.

Crystallization paths and microstructures in ternary oxide systems with stoichiometric compounds

The problems of computer model simulation of CаO-SiO2-Al2O3 system are considered. The crystallization scheme and sets of microstructure elements are analyzed for the fields of liquidus CaO, 3CaO*SiO2, 3CaO*Al2O3. The concentration fields both with individual set of microstructure elements and the fields without the unique crystallization scheme and microstructure set were found. The crystallization stages for given compositions are illustrated by the mass balance diagrams.

Reference Book on the Oxide Systems Space Diagrams as a Tool for Data Mining

The Reference Book of Ternary Oxide Systems phase diagrams computer models is presented. Its computer models of T-x-y diagrams give a possibility to calculate the mass balances at any temperature, to observe crystallization history and the process of microstructure forming at different crystallization stages. The investigation of concentration fields with the different phase constituents on the T-x-y diagram projection by means of its computer model is considered. Phase diagram of CaO-SiO2-Al2O3 system is used as an example.

Three-Phase Reaction Type Changing in Mo-Zr-V and Ti-Ir-Ru Systems

Abstract Three-dimensional (3D) computer models of T-x-y diagrams had been designed for systems Mo-Zr-V and Ti-Ir-Ru. The first diagram consists of 23 surfaces and 14 phase regions; the second one includes 75 surfaces and 32 phase regions. Temperature and concentration borders of discovered experimentally effects of three-phase transformations types changing in both systems had been determined with a help of 3D models. Such kind effects had been found also in other three-phase regions of the system Ti-Ir-Ru: in two regions with liquid and in all three regions in sub-solidus.