Time evolution of the sliding contact between two nanocrystalline surfaces under shear. The top, middle, and bottom images show glimpses into the grain structure, the grain boundaries and dislocations, and the sliding interface, respectively.

From the article:

Coarse Graining and Localized Plasticity between Sliding Nanocrystalline Metals
Pedro A. Romero, Tommi T. Järvi, Nils Beckmann, Matous Mrovec, and Michael Moseler
Phys. Rev. Lett. 113, 036101 (2014)

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