Vera P. Vorob'eva

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.

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.

Correction of T-x-y Diagrams for Lead-Free Solders

Abstract Possibilities of T-x-y diagrams three-dimensional (3D) computer models to search and to correct mistakes of thermodynamic calculations and experimental data interpretations are demonstrated. Descriptions of ternary systems in the specially published “Atlas of Phase Diagrams for Lead-Free Soldering” are used as examples. Two surfaces and two phase regions had been “missed” in isothermal sections and isopleths of Au-Bi-Sb system T-x-y diagram. Contradictions in data of the system Ag-Bi-Sn do not give the chance to understand a type of one of three invariant reactions and require other experiments. Mistakes in one of three isothermal sections and in two of five isopleths of the system Ag-Cu-Sn had been founded.

Polyhedration of Multicomponent Mineral Systems

Abstract New method of multicomponent systems concentration space polyhedration is proposed. It applies derived previously relations between initial numbers of polyhedron vertexes, including all compounds and resulting number of simplexes. Method is demonstrated on examples of quaternary reciprocal mineral systems. It is easy programmed and make possible to divide polyhedrons in complicated cases with inner points (compounds) or competition of inner diagonals (lines and planes).