PM_G_09: T-Zero Temperature
The example uses the Property Model Calculator and the T-Zero Temperature Property Model to calculate the so-called T0 line for the two-phase field FCC_A1 and BCC_A2 in the Fe-Ni system. The line is plotted together with the phase diagram for the same Fe-Ni system. The FEDEMO: Iron Demo Database is used and this example is available to all users.
The T0 temperature is defined as the temperature where two phases of identical chemical composition have the same molar Gibbs free energy. This temperature is an important quantity in the field of diffusionless phase transformations, e.g. martensitic transformation, since it is the upper limit where diffusionless phase transformations can occur.
Two Property Model Calculators are used in this example. The T0 line (a One Axis calculation) for the two-phase field FCC_A1 and BCC_A2 is overlaid on top of a the Fe-Ni Phase diagram calculation.
About the T0 Temperature Property Model
Project File Information
- Folder: Property Models → General
- File name: PM_G_09_T-Zero_temperature.tcu
Visualizations
Many of our Graphical Mode examples have video tutorials, which you can access in a variety of ways. When in Thermo‑Calc, from the menu select Help → Video Tutorials, or from the main My Project window, click Video Tutorials. Alternately, you can go to the website or our YouTube channel.
Open the example project file to review the node setup on the Project window and the associated settings on the Configuration window for each node. For some types of projects, you can also adjust settings on the Plot Renderer Configuration window to preview results before performing the simulation. Click Perform Tree to generate plots and tables to see the results on the Visualizations window.
Figure 1: In this plot for the Fe-Ni system, the T0 line for the FCC_A1 and BCC_A2 phases is located in the middle of the two-phase region. No solution for the T0 temperature exists above about 30 mass% Ni.