2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 5: Vanyukov Intl. Symp. / Non-ferrous & KIVCET
| Editors: | Kongoli F, Kozlov P, Tsymbulov L, Fedorov A, Shumskiy V |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 310 pages |
| ISBN: | 978-1-987820-28-7 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Space Diagrams for Metals' and Slags' Systems Illustrated the Processes of Self-Propagating High Temperature Synthesis
Vasily Lutsyk1; Alexandr Zyryanov1; Edward Nasrulin1; Maria Parfenova2;1INSTITUTE OF PHYSICAL MATERIALS SCIENCE SB RAS, Ulan-Ude, Russian Federation; 2TOMSK STATE UNIVERSITY OF CONTROL SYSTEMS AND RADIO-ELECTRONICS, Tomsk, Russian Federation;
Type of Paper: Regular
Id Paper: 131
Topic: 6
Abstract:
The construction of the computer 3D and 4D models of phase diagrams (PD) of metals' A-B-C-D and oxide-fluoride slags' A,B,C||F,O systems on the basis of experimental data is aimed for the elaboration of new technologies to obtain alloys and coatings. To solve such practical problems, it is important to develop new methods of studying phase transitions in three-dimensional (3D) and four-dimensional (4D) spaces with T-x-y and T-x-y-z PD (including reciprocal systems with reactions of exchange), using computer-aided design of the boundaries of the phase regions with further assembling of spatial models. They help to obtain high-quality visualization (the rotation of 3-dimensional figures, projections, construction of arbitrary given sections), to predict the crystallization schemes for any composition, to calculate the mass balances of coexisting phases at any temperature, and, taking into account the stages of their formation, to be the source of additional information about the microstructure formation. It is also allowed to estimate the phases relationship for given concentration. Such comprehensive study of system properties establishes the theoretical basis for experimental work. The schematic variants of computer models of alternative phase diagrams (which will be updated with the obtaining of new experimental and theoretical data) are analyzed for real systems. Such complex investigation of the properties of metal and reciprocal oxide-fluoride systems will optimize the SHS processes, which are used to develop new alloys and coatings, as well as to create a theoretical basis for experimental work at the refining of phase equilibria parameters. After the triangulation of 3-dimensional prisms of quaternary reciprocal A,B,C||F,O systems into the tetrahedrons, the 4D computer model of T-x-y-z diagrams of these subsystems are assembled. They permit to obtain the full description of each system, which is suitable for the elaboration of optimal compositions with given properties. For each system, the concentration fields with different crystallization schemes are analyzed and confirmed by mass balances and the series of isothermal sections and isopleths are produced. Detailed report for PD contains: - initial data for model (coordinates of binary, ternary and quaternary points on the liquidus surfaces; coordinates of compounds); - scheme of uni- and invariant equilibria; - visualization of PD in space and projections; - list of surfaces and phase regions; - horizontal and vertical sections (if there are experimental or calculated thermodynamic methods sections, then they will be compared); - tables with the list of phase transformations and elements of microstructure for concentration fields; - diagrams of mass balances for given concentrations containing the information about crystallization stages and the ratio of phase portion evolved in different parts of phase regions. In addition, such computer model of phase diagram makes possible to calculate the tie-lines and crystallization paths, to identify the effect of change of phase reactions type. It permits to obtain data about the studied system at the user's request, which significantly reduces the amount of experimental work. The work was partially supported by the Russian Foundation for Basic Research (projects 14-08-00453 and 14-08-31468).