MICRESS Forum

# Data for phase interaction 1 / 1:
# ---------------------------------
# Simulation of interaction between phase 1 and 2 ?
# Options: phase_interaction no_phase_interaction
# [standard|particle_pinning|solute_drag]
phase_interaction solute_drag

To implement the “solute_drag” model presented in MICRESS, three parameters should be defined (“critical velocity”, “transition range deltaV”, and “Drag factor”).
What is the physical meaning of these parameters?
How does this model consider solute drag effect? Is it a velocity dependent mobility?
How was the mobility related to these three factors?

Dear mtoloui,

The impurity drag model, in principal, describes a driving force dependent mobility of a grain boundary which is loaded by a solute. If a certain driving force is reached, the front breaks free, and a hysteresis effect is observed.
This behaviour can be more easily be described in terms of a velocity dependent mobility:



The important parameters are the critical velocity v* and the dragfactor, by which the mobility of the grain boundary is reduced by the drag effect. In order to prevent numerical fluctuations around the critical velocity, a transition range deltaV has to be specified. In the range between v* - 0.5 * deltaV and v* + 0.5 * deltaV, there is a linear transition between the reduced mobility µ * dragfactor and the normal mobility µ.

Bernd

Is there any option in MICRESS to enter these three parameters (“critical velocity”, “transition range deltaV”, and “Drag factor”) as temperature dependent values?

Dear mtoloui,

presently there is no such option. Would it be interesting for you?

Bernd

It would be very useful.