Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10620854 | Acta Materialia | 2007 | 7 Pages |
Abstract
We generalize a previous study of the atomic motions governing grain boundary migration to consider arbitrary misorientations of [0 0 1] tilt boundaries. Our examination of the nature of atomic motions employed three statistical measures of atomic motion: the non-Gaussian parameter, the “dynamic entropy” and the van Hove correlation function. These metrics were previously shown to provide a useful characterization of atomic motions both in glass-forming liquids and strained polycrystalline materials. As before, we find highly cooperative, string-like motion of atoms, but the grain boundary migration itself is a longer timescale process in which atoms move across the grain boundary. These observations are consistent with our previous results for Σ5 [0 0 1] tilt boundaries. It is evident from our work that the grain boundary structure and misorientation have a significant influence on the rate of grain boundary migration.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Hao Zhang, David J. Srolovitz, Jack F. Douglas, James A. Warren,