Grain boundary velocity and curvature are not correlated in Ni polycrystals
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States); Morgan Stanley, New York, NY (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States); RJ Lee Group, Inc., Monroeville, PA (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States); Blue River Technology, Sunnyvale, CA (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Ulm University (Germany)
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.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
- Grant/Contract Number:
- AC52-07NA27344; DMR 1628994; AC02-06CH11357
- OSTI ID:
- 1866159
- Report Number(s):
- LLNL-JRNL-834657; 1037825; TRN: US2306029
- Journal Information:
- Science, Vol. 374, Issue 6564; ISSN 0036-8075
- Publisher:
- AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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