Publication 24-CNA-011
Impact of Grain Boundary Energy Anisotropy on Grain Growth
Kiana Naghibzadeh
Department of Civil and Environmental Engineering
Massachusetts Institute of Technology
kiana@mit.edu
Zipeng Xu
Department of Materials Science and Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
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 Mechanical 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: A threshold dynamics model of grain growth that accounts for the anisotropy in the grain boundary energy has been used to simulate experimentally observed grain growth of polycrystalline Ni. The simulation reproduces several aspects of the observed microstructural evolution that are not found in the results of simulations assuming isotropic properties. For example, the relative areas of the lowest energy twin boundaries increase as the grains grow and the average grain boundary energy decreases with grain growth. This decrease in energy occurs because the population of higher energy grain boundaries decreases while the population of lower energy boundaries increases as the total grain boundary area decreases. This phenomenon emerges from the assumption of anisotropic grain boundary energies without modification of the energy minimizing algorithm. These findings are consistent with the observation that in addition to the decrease in grain boundary area, additional energy is dissipated during grain growth by a decrease in the average grain boundary energy.
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