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Title | T-X-Y diagrams of lead-free soldering systems with thermodynamic contours of minimal surfaces |
Authors |
Lutsyk, V.I.
|
ORCID | |
Keywords |
lead-free solders microstructures of ceramics and alloys 3D computer models of phase diagrams |
Type | Conference Papers |
Date of Issue | 2011 |
URI | http://essuir.sumdu.edu.ua/handle/123456789/20553 |
Publisher | Sumy State University |
License | Copyright not evaluated |
Citation | Lutsyk, V.I. T-X-Y diagrams of lead-free soldering systems with thermodynamic contours of minimal surfaces [Òåêñò] / V. I. Lutsyk // Nanomaterials: applications & properties. Proceedings : 1-st International conference, Alushta, Crimea, 27-30 Semptember 2011 / Edited by: A. Pogrebnjak, T. Lyutyy, S. Protsenko. - Sumy : Sumy State University, 2011. - V.2, P.². - C. 11-19. |
Abstract |
Alternative principle of the phase diagrams (PD) engineering has been offered: 1)
before proceeding with the assembly of hypothetical or real PD, a space scheme of
monovariant reactions (three-phase regions scheme) is to be elaborated; 2) contours of
the surfaces with the unruled nature are to be closed and data of thermodynamic calculations
are used on this stage; 3) surfaces should be approximated as the minimal ones,
like the soap films, with the minimal area; 4) all geometrical elements (points, lines,
surfaces, phase regions) are designated, and their “names” contain the meaning (reason)
of these designations; 5) after the computer assembling the PD space model is a useful
tool to solve different fundamental and applied tasks of materials science. E.g. solidification
paths are confirmed by the mass balances: a vertical one - for the given centre of
masses, and a horizontal one - for the isothermal state of isopleth. As computer model of
PD saves information about system in compact form and permits to receive any projection,
isotherm and isopleth with the decoding of intersected surfaces and phase regions,
it helps also to enquire the errors and incorrectly interpreted experimental data, especially
in the cases of surfaces’ degeneration because of negligibly small sizes of homogeneous
regions. To investigate a competition of tiny eutectical crystals with more large
primary crystals of the same phase in the invariant reaction with melt, an idea of “disperse”
tie-line is used, and as a result the microstructures can be located with large,
small and with mixed type of crystals.
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