Grain boundary velocity has been believed to be correlated to curvature, and this is an important relationship for modeling how polycrystalline materials coarsen during annealing. We determined the velocities and curvatures of approximately 52,000 grain boundaries in a nickel polycrystal using three-dimensional orientation maps measured by high-energy diffraction microscopy before and after annealing at 800°C. Unexpectedly, the grain boundary velocities and curvatures were uncorrelated. Instead, we found strong correlations between the boundary velocity and the five macroscopic parameters that specify grain boundary crystallography. The sensitivity of the velocity to grain boundary crystallography might be the result of defect-mediated grain boundary migration or the anisotropy of the grain boundary energy. The absence of a correlation between velocity and curvature likely results from the constraints imposed by the grain boundary network and implies the need for a new model for grain boundary migration.

中文翻译：

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Ni多晶中的晶界速度和曲率不相关

晶界速度被认为与曲率有关，这是模拟多晶材料在退火过程中如何变粗的重要关系。我们使用高能衍射显微镜在 800°C 退火前后测量的三维取向图确定了镍多晶中大约 52,000 个晶界的速度和曲率。出乎意料的是，晶界速度和曲率是不相关的。相反，我们发现边界速度与指定晶界晶体学的五个宏观参数之间存在很强的相关性。速度对晶界晶体学的敏感性可能是缺陷介导的晶界迁移或晶界能量各向异性的结果。