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Condensed Matter > Materials Science
Title: Stable nanofacets in [111] tilt grain boundaries of face-centered cubic metals
(Submitted on 14 Sep 2023 (v1), last revised 22 Apr 2024 (this version, v2))
Abstract: Grain boundaries can dissociate into facets if that reduces their excess energy. This, however, introduces line defects at the facet junctions, which present a driving force to grow the facets in order to reduce the total number of junctions and thus the system's energy. Often, micrometer-sized facet lengths are observed and facet growth only arrests for kinetic reasons. So far, energetically stable, finite-sized facets have not been observed, even though theoretical stability conditions have already been proposed. Here, we show a case where nanometer-sized facets are indeed stable compared to longer facets in [111] tilt grain boundaries in Cu by atomistic simulation and transmission electron microscopy. The facet junctions lack a Burgers vector component, which is unusual, but which removes the main energy cost of facet junctions. Only attractive interactions via line forces remain, which result from a discontinuity of grain boundary excess stress at the junction. Atomistic simulations predict that the same phenomenon also occurs in at least Al and Ag.
Submission history
From: Tobias Brink [view email][v1] Thu, 14 Sep 2023 10:55:06 GMT (19297kb,AD)
[v2] Mon, 22 Apr 2024 10:41:20 GMT (25519kb,AD)
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