Phase field simulation on the effect of micropore morphology on grain growth in porous ceramics

Abstract

The properties of the porous ceramics are known not only related to the pore-solid composite model, but also have a significant grain-size effect. In this study, a phase field simulation is carried out to study the effect of different micropores on the grain growth kinetics of porous ceramics, and results indicate that the average grain size and distribution are highly influenced by the topological shape of the second-phase. The efficiency of the grain boundary migration is determined by the pinning forces applied in the interaction of the grains and pores. The pining forces are calculated based on Zener Theory, and results indicate that the maximum pinning force is highly dependent on the second-phase shape, and the contacting mode between the grain boundaries and second-phase pores is the determining factor of the grain boundary migration in porous materials.