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Cross-Split of Dislocations: An Athermal and Rapid Plasticity Mechanism

Kositski, Roman and Kovalenko, Oleg and Lee, Seok-Woo and Greer, Julia R. and Rabkin, Eugen and Mordehai, Dan (2016) Cross-Split of Dislocations: An Athermal and Rapid Plasticity Mechanism. Scientific Reports, 6 . Art. No. 25966. ISSN 2045-2322. PMCID PMC4869067. http://resolver.caltech.edu/CaltechAUTHORS:20160601-065255489

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Abstract

The pathways by which dislocations, line defects within the lattice structure, overcome microstructural obstacles represent a key aspect in understanding the main mechanisms that control mechanical properties of ductile crystalline materials. While edge dislocations were believed to change their glide plane only by a slow, non-conservative, thermally activated motion, we suggest the existence of a rapid conservative athermal mechanism, by which the arrested edge dislocations split into two other edge dislocations that glide on two different crystallographic planes. This discovered mechanism, for which we coined a term “cross-split of edge dislocations”, is a unique and collective phenomenon, which is triggered by an interaction with another same-sign pre-existing edge dislocation. This mechanism is demonstrated for faceted α-Fe nanoparticles under compression, in which we propose that cross-split of arrested edge dislocations is resulting in a strain burst. The cross-split mechanism provides an efficient pathway for edge dislocations to overcome planar obstacles.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1038/srep25966DOIArticle
http://www.nature.com/articles/srep25966PublisherArticle
http://www.nature.com/article-assets/npg/srep/2016/160517/srep25966/extref/srep25966-s1.pdfPublisherSupplementary Information
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4869067/PubMed CentralArticle
ORCID:
AuthorORCID
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2016 Nature Publishing Group. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ Received:22 March 2016. Accepted: 25 April 2016. Published online: 17 May 2016. The authors are grateful to Prof. W.D. Nix for his insightful comments. This work was supported by the Israel Science Foundation, Grant No. 1656/12, and by the US-Israel Binational Science Foundation, Grant No. 2010148. Author Contributions: S.-W.L., O.K., J.G. and E.R. designed and performed the experiments. R.K. and D.M. designed the simulations and developed the models. R.K. and D.M. wrote the initial manuscript with input from all authors. All authors commented on the final manuscript and conclusions of this work. The authors declare no competing financial interests.
Funders:
Funding AgencyGrant Number
Israel Science Foundation1656/12
Binational Science Foundation (USA-Israel)2010148
PubMed Central ID:PMC4869067
Record Number:CaltechAUTHORS:20160601-065255489
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160601-065255489
Official Citation:Kositski, R. et al. Cross-Split of Dislocations: An Athermal and Rapid Plasticity Mechanism. Sci. Rep. 6, 25966; doi: 10.1038/srep25966 (2016).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67509
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:01 Jun 2016 20:43
Last Modified:19 Jul 2017 22:04

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