In-situ observation of the initiation of plasticity by nucleation of prismatic dislocation loops
SCIE
SCOPUS
- Title
- In-situ observation of the initiation of plasticity by nucleation of prismatic dislocation loops
- Authors
- Lee, Subin; Vaid, Aviral; Im, Jiseong; Kim, Bongsoo; Prakash, Arun; Guenole, Julien; Kiener, Daniel; Bitzek, Erik; Oh, Sang Ho
- Date Issued
- 2020-05
- Publisher
- NATURE PUBLISHING GROUP
- 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. Prismatic dislocation loops (PDLs) form during the elastic-to-plastic transition of a dislocation-free volume under nanoindentation. Here the authors observe the initial plasticity and burst-like emission of PDLs in Au nanowires by in-situ transmission electron microscopy, elucidating fundamental aspects of the formation process.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/106919
- DOI
- 10.1038/s41467-020-15775-y
- ISSN
- 2041-1723
- Article Type
- Article
- Citation
- NATURE COMMUNICATIONS, vol. 11, no. 1, 2020-05
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- There are no files associated with this item.
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