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Hussein, Omar ; Keith Coffman, D. ; Hattar, Khalid ; Lang, Eric ; Dillon, Shen J. ; Abdeljawad, Fadi ( , Applied Physics Letters)more » « less
We demonstrate using theoretical, computational, and experimental studies a morphological instability, in which a polycrystalline nanorod breaks up at grain boundaries (GBs) into an array of isolated domains. Our theoretical model is used to establish a neutral stability surface demarcating stable and unstable perturbations. It is shown that GBs play a destabilizing role in which the critical wavelength for the instability decreases with the increase in the GB energy. We carry out phase field simulations, which reveal accelerated pinch-off kinetics with the increase in the GB energy and predict temporal evolution of interfacial profiles in quantitative agreement with experimental observations.
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Moore, Robert D. ; Beecroft, Timothy ; Rohrer, Gregory S. ; Barr, Christopher M. ; Homer, Eric R. ; Hattar, Khalid ; Boyce, Brad L. ; Abdeljawad, Fadi ( , Acta Materialia)
