Microstructure evolution during sintering: discrete element method approach

L Engelke and L Brendel and DE Wolf, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 106, 5022-5032 (2023).

DOI: 10.1111/jace.19131

We present a new numerical model describing the transformation of a powder of crystalline particles into a dense poly-crystalline material. It is based on the key phenomena of sintering: shrinkage and grain coarsening driven by the minimization of the free energy. Representing each grain by a truncated sphere, the model takes into account the complex and changing shape of grains for determining the thermodynamic driving forces and associated kinetic coefficients. We validate the model by comparing the temporal evolution of a system of four particles with that obtained from a mesh-based method. We performed simulations on polydisperse packings of up to 16,000 particles. Using material and process parameters from the literature, the model accurately reproduces experimental data on the evolution of the grain size distribution for alumina.

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