Benchmark 2D single grain growth with square law
Posted: Wed Feb 26, 2020 7:27 pm
Hi all,
Asking on behalf of a colleague:
My colleague is doing some benchmark work on grain growth. Basically he started by modelling the shrinkage of a single round grain inside an infinitely big grain (using periodical boundary conditions). He adapted the model from a recrystallization simulation and set the chemical driving force (difference in recrystallization energy) infinitely small (when he set it to 0 the simulation cannot run) so the shrinkage is mostly driven by curvature. He tried to benchmark MICRESS result with the parabolic grain growth law by Burke and Turnbull:
where the constant is related to interfacial energy.
He found a few problems:
(1) At the very first time step, the grain is supposed to shrink but instead it grew, and then started to shrink.
(2) The overall shrinking kinetics (change in grain radius) is not the same as the analytical model. The MICRESS result gives faster shrinkage.
All his model parameters seem reasonable to me and we wonder what could go wrong, especially why there is an initial growth.
Thanks,
Billy/KY
Asking on behalf of a colleague:
My colleague is doing some benchmark work on grain growth. Basically he started by modelling the shrinkage of a single round grain inside an infinitely big grain (using periodical boundary conditions). He adapted the model from a recrystallization simulation and set the chemical driving force (difference in recrystallization energy) infinitely small (when he set it to 0 the simulation cannot run) so the shrinkage is mostly driven by curvature. He tried to benchmark MICRESS result with the parabolic grain growth law by Burke and Turnbull:
where the constant is related to interfacial energy.
He found a few problems:
(1) At the very first time step, the grain is supposed to shrink but instead it grew, and then started to shrink.
(2) The overall shrinking kinetics (change in grain radius) is not the same as the analytical model. The MICRESS result gives faster shrinkage.
All his model parameters seem reasonable to me and we wonder what could go wrong, especially why there is an initial growth.
Thanks,
Billy/KY