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Atomic motion during the migration of general [0 0 1] tilt grain boundaries in Ni

✍ Scribed by Hao Zhang; David J. Srolovitz; Jack F. Douglas; James A. Warren

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
658 KB
Volume
55
Category
Article
ISSN
1359-6454

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✦ Synopsis

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 R5 [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.

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