Publication 22-CNA-005
Comparison of simulated and measured grain volume changes during grain growth
Xiaoyao Peng
Department of Civil and Environmental Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
xiaoyaop@andrew.cmu.edu
Aditi Bhattacharya
Department of Materials Science and Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
Kiana Naghibzadeh
Department of Civil and Environmental Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
snaghibz@andrew.cmu.edu
David Kinderlehrer
Department of Mathematical Sciences
Carnegie Mellon University
Pittsburgh, PA 15213
davidk@andrew.cmu.edu
Robert Suter
Department of Physics
Department of Materials Science and Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
Kaushik Dayal
Center for Nonlinear Analysis
Department of Civil and Environmental Engineering
Department of Materials Science and Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
Kaushik.Dayal@cmu.edu
Gregory S. Rohrer
Department of Materials Science and Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
rohrer@cmu.edu
Abstract: 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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