Characterization and visualization of grain boundary disconnections

IS Winter and T Oppelstrup and T Frolov and RE Rudd, ACTA MATERIALIA, 237, 118067 (2022).

DOI: 10.1016/j.actamat.2022.118067

We introduce a method to visualize dislocations along grain boundaries at the atomic level. It uses an atomic-level Nye tensor, representing the dislocation density. To calculate the Nye tensor at grain bound- aries, we extend the Hartley-Mishin strain gradient calculation to the displacement shift complete lattice. We show that the method is effective in visualizing disconnections and the dislocation content of grain boundary phase junctions in body-centered cubic tungsten, as well as face-centered cubic copper. In ad-dition, we use the method to characterize the morphology of a two-dimensional grain boundary phase nucleus in a symmetric tilt grain boundary in tungsten. This method can be applied to both bulk disloca-tions and grain boundary disconnections, which makes it ideal for studying the interactions and reactions of bulk dislocations with grain boundaries, and grain boundary disconnections.(c) 2022 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

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