Pseudo Binary Section

Sometimes a ternary isoplethal section is so special that all the tie-lines are within this section to form a pseudo binary section. To calculate this type of section, a special algorithm is designed in Pandat™ and a special keyword “pseudo” is required. In the folder where Pandat™ software is installed:

Pandat 2024 Examples/PanPhaseDiagram/Pseudo_Binary/,

There is an example A-B-C system with “ABC.tdb”. After load the database file, click on “Section Calculation”; the normal section calculation conditions can be set as shown in Figure 1 for AB-AC isoplethal section calculation. The advanced Pseudo section calculation function is introduced in Pandat™. Once the “Pseudo” box is checked, the select species dialog will pop out as shown in Figure 2 for users to select or define the species for Pseudo section calculations. For example, users can define A1B and A1C as two species for the AB-AC Pseudo binary section in A-B-C system. After the two species are defined, the “Section Calculation” interface changes to using the defined species for conditions setting as shown in Figure 3. The calculated pseudo binary section is shown in Figure 4.

Note: The species defined here is used as two end members for Pseudo section calculation. They are different from the species defined in the database. The species name must separate with a number, for example, A1B.


Figure 1: Set calculation condition for a normal AB-BC section based on elements	Figure 2: Define A1B and A1C as species for a Pseudo section calculation


Figure 3: Set calculation condition for an AB-BC pseudo-binary section based on defined species	Figure 4: A calculated pseudo-binary section in ternary A-B-C system