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Grain boundaries can dissociate into facets if that reduces their excessenergy. This, however, introduces line defects at the facet junctions, whichpresent a driving force to grow the facets in order to reduce the total numberof junctions and thus the system's energy. Often, micrometer-sized facetlengths are observed and facet growth only arrests for kinetic reasons. So far,energetically stable, finite-sized facets have not been observed, even thoughtheoretical stability conditions have already been proposed. Here, we show acase where nanometer-sized facets are indeed stable compared to longer facetsin [111] tilt grain boundaries in Cu by atomistic simulation and transmissionelectron microscopy. The facet junctions lack a Burgers vector component, whichis unusual, but which leads to attractive interactions via line forces.Atomistic simulations predict that the same phenomenon also occurs in at leastAl and Ag.

Stable Nanofacets in [111] Tilt Grain Boundaries of Face-Centered Cubic Metals