Triple Junction Segregation Dominates the Stability of Nanocrystalline Alloys
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36 MATERIALS SCIENCE↗
Engineering topics
Hussein, Omar
Publications and source records attributed to Hussein, Omar.
Plateau–Rayleigh instability with a grain boundary twist
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.
Hussein, Omar↗