The FactSage SGTE alloy database
With FactSage 5.3 & 5.4 there have been many changes, not only in the content of the databases, but in the way they are organized and used. Be sure to read the general documentation "How to use the databases with FactSage 5.4" on the previous menu.
TO OBTAIN :
- A LIST OF all the unary, binary, ternary and quaternary SYSTEMS WHICH HAVE BEEN ASSESSED
- A LIST OF ALL ASSESSED phases IN EACH OF THE SYSTEMS
- A CALCULATED PHASE DIAGRAM FOR EACH OF THE LISTED BINARY SYSTEMS
- ASSiSTANCE WITH PHASE SELECTION
CLICK ON "List of optimized systems and calculated binary phase diagrams."
The SGTE database is an extensive new update (2004) of the previous SGSL (1991) alloy database.
The 78 elements included in the database are:
Ag, Al, Am, As, Au, B, Ba, Be, Bi, C, Ca, Cd, Ce, Co, Cr, Cs, Cu, Dy, Er, Eu, Fe, Ga, Gd, Ge, Hf, Hg, Ho, In, Ir, K, La, Li, Lu, Mg, Mn, Mo, N, Na, Nb, Nd, Ni, Np, O, Os, P, Pa, Pb, Pd, Pr, Pt, Pu, Rb, Re, Rh, Ru, S, Sb, Sc, Se, Si, Sm, Sn, Sr, Ta, Tb, Tc, Te, Th, Ti, Tl, Tm, U, V, W, Y, Yb, Zn, Zr
From among these elements, there are some 300 completely assessed binary alloy systems (ca. 155 in the old SGSL database) together with about 120 ternary and higher-order systems (ca. 70 in the old SGSL database) for which assessed parameters are available for phases of practical relevance. The systems now incorporate 177 different solution phases (64 in SGSL) and 588 stoichiometric intermetallic compound phases (263 in SGSL).
A large number of new published assessments, some amendments and some updates are now incorporated in this significantly upgraded general alloy database. The database is intended to provide a sound basis for calculations relating to the production, heat treatment, constitution, and application of a wide range of alloy types.
All the assessed binary systems included in the SGTE alloy database are described over all ranges of composition and temperature, i.e. the assessed data provide a good description of the complete phase diagrams and thermodynamic properties for the binary alloy systems concerned.
Although a large number of ternary interaction parameters are included for the different phases in the database, these are in many cases associated only with phases rich in a particular metal. As such, care should be exercised in calculating phase equilibria for other composition ranges of multi-component alloys. By referring to the listing of systems and phases for which assessed parameters are available, the user can determine whether proposed calculations for a particular higher-order system will be based on a complete set of assessed binary and ternary parameters (at best) or summation of binary parameters only (at worst). Clearly the latter case, or use of incompletely assessed data sets, can lead to incorrect or unreliable results.
In a binary system, if no assessed mixing parameters are available for a particular phase, the phase will be treated as ideal. Correspondingly, the properties of a ternary or higher-order phase will be calculated applying the appropriate models used in the database. This procedure may give useful results if the alloy compositions in question are close to a pure component or to a binary edge for which assessed data are available. However, results of calculations for other composition ranges should be treated with extreme caution.
The database is intended to allow calculation over all ranges of composition, although, as mentioned above, the assessed data are often most reliable for metal-rich composition ranges.
The database is generally most reliable for the temperature range of approximately 200oC to 2000oC, although the assessed data for some alloys containing high melting point metals are reliable to still higher temperatures.
In the assessments, the liquid phase has been described using a simple substitutional solution approach based on the Redlich-Kister-Muggianu polynomial expression. Most of the solid phases have been described using sublattice models which include interstitials and vacancies where appropriate.
The phase diagrams of all the binary systems listed above have been checked using FactSage.
If there is the possibility of a miscibility gap (or 2 miscibility gaps) occurring in the LIQUID, FCC, BCC or HCP phase, the I-option (J-option) must be used in selecting that phase for the calculations.
The I-option also needs to be used with the ordered solid solutions, B2_BCC and L12_FCC, which are based on the BCC or FCC disordered state (see below).