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MTDATA is a software which predicts the phases forming at equilibrium in systems containing many components and many phases. It is based upon critically assessed thermodynamic data for simpler sub-systems, and use a very robust algorithm (STAGE_1).

This introduction is based on examples and applications typical of what is done in our phase-transformation group.

It is relatively easy to start with MTDATA, but many possibilities are difficult to discover, here are those I think about now:

• Calculate a simple equilibrium given the composition and the temperature. It is also possible to set paraequilibrium conditions.
• Vary a single variable between two values (temperature, w% of a component,...) and plot whichever other variable of interest as a function of the stepped one, this could be:
1. number of moles (kg, ...) of one or all phases.
2. gibbs free energy of the different phases or all the system.
3. distribution of the component within the phases, etc.
• Draw ternary diagrams, pseudo-ternary (ternary section in a multicomponent system), pseudo binary (isopleth), save all these as post-script or EPS files, or save them as metafile and modify them so as to get them the way you want (larger fonts, remove useless coments, etc...).
• Write macros to simplify repetitive tasks.
• Call directly MTDATA from a fortran program.

Here are some interesting references:

1. Thermodynamics, H. K. D. H. Bhadeshia
2. MTDATA handbook, in 309.
3. The SGTE casebook, K.Hack ed., The institute of Materials.
4. CALPHAD Calculation of Phase Diagrams, A Comprehensive Guide, R. W. Cahn ed., Pergamon (Elsevier Ltd).
5. Phase Equilibria, Phase Diagrams and Phase Transformations, Their Thermodynamics Basis, M. Hillert, Cambridge University Press.

 PT-group 2003 Thomas Sourmail, Cambridge.