Papers › Comparison of simulated and measured grain volume changes during grain growth
Comparison of simulated and measured grain volume changes during grain growth
Xiaoyao Peng, Aditi Bhattacharya, S. Kiana Naghibzadeh, David Kinderlehrer, Robert Suter, Kaushik Dayal, Gregory S. Rohrer
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The three-dimensional microstructure of Ni, observed after five annealing intervals, was compared to simulations of grain growth using the threshold dynamics method with the assumption of capillarity as the only driving force. A grain-by-grain comparison made it possible to identify the sources of differences between the simulation and experiment. The most significant difference was for grains of the smallest sizes, which the simulation predicted would lose volume and disappear at a greater rate than observed in the experiment. The loss of grains created errors in the numbers of neighbors of the remaining grains, and it was found that errors in the simulated grain volume were correlated to errors in the number of near neighbors. While anisotropic grain boundary properties likely play a role in the differences, the size dependence of the errors suggest that it might be necessary to include a size dependence in the model for grain boundary migration kinetics.
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