2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 3: Takano Intl. Symp. / Metals & Alloys Processing
| Editors: | Kongoli F, Noldin JH, Mourao MB, Tschiptschin AP, D'Abreu JC |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 550 pages |
| ISBN: | 978-1-987820-26-3 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Phase Diagrams with Melt Immiscibility and System Fe-Cu-S
Vasily Lutsyk1; Vera Vorob'eva1; Alexandr Zyryanov1; Svetlana Shodorova1;1INSTITUTE OF PHYSICAL MATERIALS SCIENCE SB RAS, Ulan-Ude, Russian Federation;
Type of Paper: Regular
Id Paper: 121
Topic: 3
Abstract:
To examine in detail the special features of the structure of the T-x-y diagrams with the immiscibility of the liquids, which are given in the literature sometimes with the inaccuracies or even with the errors, the 3-dimensional (3D) computer models of T-x-y diagrams are designed. Some of them are formed either by binary systems with monotectics or have monotectic transformations in the ternary system (without the immiscibility in the binary systems). There are diagrams with the co-existence of three liquid phases, and also diagrams with the sintectic uni- or invariant transformation. They all are included in the electronic Reference book, which contains 3D models of the diagrams T-x-y: 1) with the continuous series of solid solutions; 2) with the uni- and invariant transformations, given by one, two or three binary solubility gaps of eutectic and peritectic type; 3) with the binary and ternary compounds; 4) with the allotropy of components in different temperature intervals; 5) with the immiscibility.
The diagrams of the topology, not described before, but discovered in real systems, are included also in the Reference book. Each computer model is the template of phase diagram, which is converted into the model of the real system if to introduce experimental parameters (concentrations and temperatures of binary and ternary invariant points, and also characteristics of lines and surfaces curvature).
For instance, the subsystem Cu-Cu2S is characterized by the co-existence of two immiscible alloys in the presence of the compound Cu2S: L1=L2+R4.
The invariant monotectic reaction L1=L2+A1+R4 takes a place in the ternary subsystem Fe-FeS-Cu2S-Cu at 1074 C, and the immiscibility gap intersects the curve of the co-crystallization of the compound Cu2S and the intermediate polymorphous modification of iron gamma-Fe. Furthermore, another two invariant reactions L+gamma-Fe=Cu+Cu2S at 1070 C and L=gamma-Fe+FeS+Cu2S at 914 C take a place in the subsystem. The main innovation in 3D models consists of the construction of pseudo-fold on the solidus surface of the gamma-Fe modification. It is the directing of two ruled surfaces, it does not influence the smoothness of solidus and liquidus and solidus surfaces are topologically equivalent thanks to it.
The work was partially supported by the Russian Foundation for Basic Research (projects 14-08-00453 and 14-08-31468).
Keywords:
Copper; Iron; Metallurgy; Modeling;References:
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