In-situ observation of the initiation of plasticity by nucleation of prismatic dislocation loops

Subin Lee, Aviral Vaid, Jiseong Im, Bongsoo Kim, Arun Prakash, Julien Guénolé, Daniel Kiener, Erik Bitzek and Sang Ho Oh ()
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Subin Lee: Pohang University of Science and Technology (POSTECH)
Aviral Vaid: Institute I: General Materials Properties
Jiseong Im: Pohang University of Science and Technology (POSTECH)
Bongsoo Kim: Department of Chemistry, KAIST
Arun Prakash: Institute I: General Materials Properties
Julien Guénolé: Institute I: General Materials Properties
Daniel Kiener: Montanuniversität Leoben
Erik Bitzek: Institute I: General Materials Properties
Sang Ho Oh: Pohang University of Science and Technology (POSTECH)

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract The elastic-to-plastic transition during the deformation of a dislocation-free nanoscale volume is accompanied by displacement bursts associated with dislocation nucleation. The dislocations that nucleate during the so-called “pop-in” burst take the form of prismatic dislocation loops (PDLs) and exhibit characteristic burst-like emission and plastic recovery. Here, we report the in-situ transmission electron microscopy (TEM) observation of the initial plasticity ensued by burst-like emission of PDLs on nanoindentation of dislocation-free Au nanowires. The in-situ TEM nanoindentation showed that the nucleation and subsequent cross slip of shear loop(s) are the rate-limiting steps. As the indentation size increases, the cross slip of shear loop becomes favored, resulting in a transition from PDLs to open half-loops to helical dislocations. In the present case of nanoindentation of dislocation-free volumes, the PDLs glide out of the indentation stress field while spreading the plastic zone, as opposed to the underlying assumption of the Nix-Gao model.

Date: 2020
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DOI: 10.1038/s41467-020-15775-y

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