Multiscale Phase-Field Modeling of Sintering and Diffusion Bonding

The work develops a finite-element phase-field framework in COMSOL Multiphysics to simulate high-temperature sintering and diffusion bonding, coupling concentration fields, grain-boundary order parameters, lattice deformation, and multiple diffusion mechanisms (surface, grain-boundary, and bulk) through 14 coupled nonlinear PDEs. Simulations of two-particle systems show that surface mobility produces broader necks (~12 nm) with localized vacancy and lattice formation, whereas grain-to-grain mobility yields sharper, more uniform necks and smoother atom redistribution. Phase 1 of the model (diffusion + phase-field coupling) is complete and validated against classical Allen-Cahn/Cahn-Hilliard equations; Phase 2 is now integrating mechanics (particle motion, rotation, and stress evolution) to enable predictive multi-grain simulations for tailored high-performance ceramics.

Видео Multiscale Phase-Field Modeling of Sintering and Diffusion Bonding канала Beckman WSU Official