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The resulting microstructure after the sintering process determines manymaterials properties of interest. In order to understand the microstructuralevolution, simulations are often employed. One such simulation method is thephase-field method, which has garnered much interest in recent decades.However, the method lacks a complete model for sintering, as previous workscould show unphysical effects and the inability to reach representative volumeelements. Thus the present paper aims to close this gap by employing moleculardynamics and determining rules of motion which can be translated to aphase-field model. The key realization is that vacancy absorption inducedmotion of grains travels through a grain structure without resistance. Hencethe total displacement field of a green body is simply the superposition of allgrains reacting in isolation to local vacancy absorption events. The resultingphase-field model is shown to be representative starting from particle countsbetween 97 and 262 and contains the qualitative correct dependence of sinteringrate on particle size.

Unravelling densification during sintering by multiscale modelling of grain motion