Most metallic and ceramic materials are comprised of a space-filling collection of crystalline grains separated by grain boundaries. While this grain structure has been studied for more than a century, there few rigorous results regarding its global properties available in the literature. We present a new, rigorous result for three-dimensional grain structures that relates the integral of the Gaussian curvature over the grain boundaries to the numbers of grains and quadruple junctions. The result is numerically verified for a grain structure consisting of periodic truncated octahedra.
@article{arxiv.2109.08072,
title = {A constant of motion for ideal grain growth in three dimensions},
author = {Erdem Eren and Jeremy Kyle Mason},
journal= {arXiv preprint arXiv:2109.08072},
year = {2021}
}