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Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 22: Poster session I

MM 22.22: Poster

Montag, 20. März 2017, 19:00–20:00, P4

Abnormal coarsening of nanoscale microstructures goes fractal — •Christian Braun1, Jules M. Dake2, Carl Krill2, and Rainer Birringer11Experimental Physics, Universität des Saarlandes, Germany — 2Institute of Micro and Nanomaterials, Universität Ulm, Germany

Despite the supposed rarity implicit in its name, abnormal grain growth (AGG) appears to be a rather common mode of coarsening in nanocrystalline materials, regardless of composition or synthesis route. In inert-gas-condensed nanocrystalline Pd90Au10, thermally induced coarsening fulfills the criteria for AGG, but with an unusual twist: here, the subpopulation of abnormally growing grains sends offshoots in many directions into the surrounding matrix, much like a tumor spreading into nearby tissue! The resulting irregular growth fronts manifest a fractal-like morphology instead of the smooth interfaces observed in conventional samples. We have captured this phenomenon using orientation imaging based on electron backscatter diffraction and obtained a fractal dimension of about 1.2 for the grain perimeter, which is reminiscent of percolation processes, the migration of domain walls in a random field of pinning centers or fractal lines on ranked surfaces.

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