Grain growth jointly affected by immobile and mobile particles

Abstract

Grain growth under the influence of randomly distributed particles is studied by numerical simulation using Onsager's principle. It was found that at small initial volume fraction of particles, normal grain growth evolves, with its kinetic law depending on the particle dissolution rate and its rate affected by particle mobility. At large initial volume fraction of particles, abnormal grain growth develops whereas an increase in particle mobility can lead to evolution of normal grain growth instead. Results of the simulations describe the effects behind some experimental data, lacking an explanation so far. They also allow improving existing and develop new technological solutions in the field of grain structure control and design.