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|Author(s):||Hao Zhang; David J. Srolovitz; Jack F. Douglas; James A. Warren;|
|Title:||Atomic Motion During the Migration of General  Tilt Grain Boundaries in Ni|
|Published:||August 24, 2007|
|Abstract:||We generalize a previous study of the atomic motions governing grain boundary migration to consider arbitrary misorientations of  tilt boundaries. Our examination of the nature of atomic motions employed three statistical measures: 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 time scale process in which atoms move across the grain boundary. These observations are consistent with our previous results for Sigma 5  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.|
|Pages:||pp. 4527 - 4533|