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The three-dimensional microstructure of Ni, observed after five annealingintervals, was compared to simulations of grain growth using the thresholddynamics method with the assumption of capillarity as the only driving force. Agrain-by-grain comparison made it possible to identify the sources ofdifferences between the simulation and experiment. The most significantdifference was for grains of the smallest sizes, which the simulation predictedwould lose volume and disappear at a greater rate than observed in theexperiment. The loss of grains created errors in the numbers of neighbors ofthe remaining grains, and it was found that errors in the simulated grainvolume were correlated to errors in the number of near neighbors. Whileanisotropic grain boundary properties likely play a role in the differences,the size dependence of the errors suggest that it might be necessary to includea size dependence in the model for grain boundary migration kinetics.

Comparison of simulated and measured grain volume changes during grain growth