Abstract: Design of 3D computer model has been started with a scheme of uni- and invariant states in both tabular and 3D forms. Firstly, the analysis of the geometric structure of T-x-y diagram is depicted in the form of template (prototype). Then experimental data are introduced, and the prototype is converted into the model of real diagram. It is convenient to use the Reference of 3D computer models of T-x-y diagrams of basic topological types, which contains the computer models of nearly 300 phase diagrams of ternary and quaternary systems and include the commentaries in the case of questionable (or incorrectly depicted in the literature source) geometric elements. Since the combined diagrams include the majority of real systems, then, composing the combinations of the known topology diagrams from the Reference, it is possible to obtain the computer models of necessary configuration. Based on the example of complex combined diagrams it is more easily to understand as with the aid of the scheme of uni- and invariant states to decode the geometric structure, given by liquidus and several isothermal sections and isopleths in the sub-solidus. E.g. the high-temperature part (above 914^oC) of the T-x-y diagram of the subsystem Fe-FeS-Cu₂S-Cu contains 68 surfaces, including the liquid immiscibility surface, and 32 phase regions. The analysis of geometric structure is carried out with the aid of the computer models of phase diagrams with the liquid immiscibility, which are formed by binary systems with monotectics, either with monotectic transformations in the ternary system without the immiscibility in binary systems, with immiscibility of three and even four liquid phases in the ternary system, and also diagrams with the syntectic uni- and invariant transformations have been designed. The coordinates of the prototype invariant points are given taking into account a temperature row, so as to most clearly show the diagram geometric structure.

Keywords: Phase Diagram, Space Computer Model, Quaternary System

Biography: Dr. Lutsyk is the head of computer-aided materials design sector in the Institute of Physical Materials Science of the Russian Academy of Sciences. He received: Master's Degree - from Donetsk University, Ukraine; Ph.D. under supervision of Prof. Marx Mokhosoev - from Institute of Chemistry of Tajic Academy of Sciences, Dushanbe; Doctor’s Degree on physical chemistry - from Irkutsk University, Russia. He has published more than 300 papers. His current work focuses on the assembling of the multidimensional phase diagrams of the multicomponent systems to decode the materials genome. He is awarded by “IAAM Medal-2017”.