Mechanism of {Shear-Induced} Alignment in Bilayer Thin Films of Spherical Particles

Publication Type
Journal Article
Year of Publication
2007
Authors
Rottler, Jörg
Srolovitz, David J.
Name of Publication
Physical Review Letters
Volume
98
Abstract

The phenomenon of shear-induced alignment in polycrystalline bilayer systems is analyzed using Brownian dynamics simulations. We show that the alignment process can be explained in terms of a local grain boundary migration mechanism. Both microscopic and continuum models are constructed that predict the boundary migration velocity as a function of local structure and shear stress. In the continuum picture, shear-induced potential energy gradients act as the driving force for migration, and the grain boundary mobility is sensitive to the degree of misorientation between the grains.


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