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

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Lee S,Vaid A,Im J,Kim B,Prakash A,Guénolé J,Kiener D,Bitzek E,Oh SH

doi

10.1038/s41467-020-15775-y

subject

Has Abstract

pub_date

2020-05-12 00:00:00

pages

2367

issue

1

issn

2041-1723

pii

10.1038/s41467-020-15775-y

journal_volume

11

pub_type

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