What is it about?
Thermodynamic modeling of phase diagrams is a key aspect of today's technology. As, in the past, experimentation was the main source about constitution of alloy, today it s equally common to do a CALPHAD calculation, via Thermo-calc, Fact-Sage, OpenCALPHAD or pycalphad. The employed models, however, have limits and should be properly used. This work shows that ternary interaction parameters (energy parameters describing the interaction ot three alloy components) cannot be neglected in some cases.
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Why is it important?
The proper use of thermodynamic models avoid the introduction of errors (in technical terms, artifacts) in the calculation. The community has some ideas about this, but sometimes these are biased by personal opinions. Therefore t s always important to use the scientific method to show how these modes are to be used.
Perspectives
It is always a joy to see a student brightening. This is the case of this article. Idealization, composition and execution was all made by Prof. Luiz T. F. Eleno, my coauthor and nowadays professor n the Materials Engineering course of the Escola de Engenharia de Lorena, then my PhD student. My contribution was mainly in reviewing the text and principally in persistence, since this paper was rejected by many magazines before being accepted by the Brazilian Journal of Physics. We had the displeasure to learn, for example, the a paper on theory of materials thermodynamics was "out of scope" of CALPHAD.
Professor Claudio Geraldo Schön
Universidade de Sao Paulo Campus da Capital
Read the Original
This page is a summary of: Ternary Interaction Parameters in Calphad Solution Models, Brazilian Journal of Physics, March 2014, Springer Science + Business Media,
DOI: 10.1007/s13538-014-0183-0.
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