Ternary Phase Diagrams

You can use the TCS Nb-based Alloys Database (TCNB) to plot ternary phase diagrams in Thermo-Calc. Each assessed ternary system is modeled to accurately describe experimental phase diagram data available in the literature. These examples show a selection of the important assessed systems that are the building blocks of the database itself when applying the CALPHAD method.

The CALPHAD Method and the Thermo‑Calc Databases. Also visit the video tutorials on our website or our YouTube playlist.

When working in Thermo‑Calc with ternary diagrams you use either the Ternary Calculator (in Graphical Mode) or the Ternary module (in Console Mode). The fundamental calculation engine is the same but you access the settings in different ways.

C-Nb-Ti Isothermal Section

Calculated C-Nb-Ti isothermal section at 1773 K with experimental data

Figure 1: Calculated C-Nb-Ti isothermal section at 1773 K with experimental data from [1965Fed] and [1970Rud].

C-Nb-Ti Vertical Section

Calculated vertical section of C-Nb-Ti at 5 at. % C with experimental data

Figure 2: Calculated vertical section of C-Nb-Ti at 5 at. % C with experimental data from [1970Rud].

Nb-Si-Ti Liquidus Projection

Calculated Nb-Si-Ti liquidus projection with experimental data

Figure 3: Calculated Nb-Si-Ti liquidus projection with experimental data from [1997Bew] and [2017Gig].

References

[1965Fed] T.F. Fedorov, N.M. Popova, E.I. Gladyshevskii, Ternary systems Hf-Nb-C, Zr-Nb-C, and Ti-Nb-C, Izv. Akad. Nauk. SSSR, Met. (1965) 158–163.

[1970Rud] E. Rudy, Phase Equilibrium Investigation of Binary, Ternary, and Higher Order Systems. I. Phase Diagrams of the Systems Titanium-Niobium-Carbon, Titanium-Tantalum-Carbon, and Titanium-Molybdenum-Carbon, Mater. Res. Lab., Aerojet- Gen. Corp., Sacramento, CA, USA, 1970.

[1997Bew] B. P. Bewlay, M. R. Jackson, H. A. Lipsitt, The Nb-Ti-Si ternary phase diagram: Evaluation of liquid- solid phase equilibria in Nb-and Ti-rich alloys. J. Phase Equilibria. 18, 264–278 (1997).

[2017Gig] J. C. Jânio Gigolotti, G. C. Coelho, C. A. Nunes, P. A. Suzuki, J.-M. Joubert, Experimental evaluation of the Nb Si Ti system from as-cast alloys. Intermetallics. 82, 76–92 (2017).