Entering Phases in Regions

There is no supersaturation locally within a given region.

When defining a region you need to enter one or more phases into the region. The number and type of phases depends on the simulation you want to run.

  • To simulate diffusion of components within one phase, enter one matrix phase into the region.
  • To simulate how an interface between regions moves, enter two regions with at least one phase in each.
  • To simulate growth of one or more dispersed phases in a matrix phase, enter one matrix phase and one or more spheroid phases.

About Phases

  1. Complete Defining a System in Console Mode and Creating Regions and Gridpoints.
  2. Use ENTER_PHASE_IN_REGION. Specify whether the phase is to be Active or Inactive.
  3. For an inactive phase, specify the following:
    • Enter the name of the region and the side of that region which the phase is attached to.
    • Enter the required driving force (evaluated as DGM1, and it is dimensionless (phase) in POLY-3) to be used for determining whether an inactive phase is stable.
    • Enter the CONDITION TYPE that the phase boundary condition should be set to if the inactive phase becomes stable. (Inactive phases are only considered in the simulation calculations once it is stable.)
  4. For an active phase specify the following:
    • REGION NAME for the region in which the phase is to be entered.
    • PHASE TYPE: Matrix, Lamellar or Spheroid. SPHEROID is only available if a MATRIX phase is created first. You can only enter one matrix phase in each region.
    • Enter the PHASE NAME. You can append a hash sign (#) and a digit at the end of the phase name to designate the composition set number (e.g. FCC#2). If you do not append this and the phase has more than one composition set, then you are prompted to specify a composition set number.