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Microstructure versus Flaw: Mechanisms of Failure and Strength in Nanostructures

Gu, X. Wendy and Wu, Zhaoxuan and Zhang, Yong-Wei and Srolovitz, David J. and Greer, Julia R. (2013) Microstructure versus Flaw: Mechanisms of Failure and Strength in Nanostructures. Nano Letters, 13 (11). pp. 5703-5709. ISSN 1530-6984. http://resolver.caltech.edu/CaltechAUTHORS:20131220-135618467

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Abstract

Understanding failure in nanomaterials is critical for the design of reliable structural materials and small-scale devices with nanoscale components. No consensus exists on the effect of flaws on fracture at the nanoscale, but proposed theories include nanoscale flaw tolerance and maintaining macroscopic fracture relationships at the nanoscale with scarce experimental support. We explore fracture in nanomaterials using nanocrystalline Pt nanocylinders with prefabricated surface notches created using a “paused” electroplating method. In situ scanning electron microscopy (SEM) tension tests demonstrate that the majority of these samples failed at the notches, but that tensile failure strength is independent of whether failure occurred at or away from the flaw. Molecular dynamics simulations verify these findings and show that local plasticity is able to reduce stress concentration ahead of the notch to levels comparable with the strengths of microstructural features (e.g., grain boundaries). Thus, failure occurs at the stress concentration with the highest local stress whether this is at the notch or a microstructural feature.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/nl403453hDOIArticle
http://pubs.acs.org/doi/abs/10.1021/nl403453hPublisherArticle
ORCID:
AuthorORCID
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2013 American Chemical Society. Received: September 16, 2013; Revised: October 17, 2013; Published: October 29, 2013. X.W.G. is grateful for financial support from the National Defense Science and Engineering Graduate (NDSEG) Fellowship, 32 CFR 168a. J.R.G. acknowledges the financial support of the National Science Foundation (DMR-1204864). X.W.G. and J.R.G. thank the Kavli Nanoscience Institute at Caltech for the availability of critical cleanroom facilities. We thank V. Deshpande and D. Jang for helpful discussion and D. Jang and C. Garland for TEM assistance. The authors gratefully acknowledge the financial support from the Agency for Science, Technology and Research (A*STAR), Singapore and the use of computing resources at the A*STAR Computational Resource Centre, Singapore.
Group:Kavli Nanoscience Institute
Funders:
Funding AgencyGrant Number
National Defense Science and Engineering Graduate (NDSEG) Fellowship32 CFR 168a
NSFDMR-1204864
Agency for Science, Technology and Research (A*STAR)UNSPECIFIED
Subject Keywords:Size effect; nanocrystalline; mechanical properties; fracture; molecular dynamics
Record Number:CaltechAUTHORS:20131220-135618467
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20131220-135618467
Official Citation:Microstructure versus Flaw: Mechanisms of Failure and Strength in Nanostructures X. Wendy Gu, Zhaoxuan Wu, Yong-Wei Zhang, David J. Srolovitz, and Julia R. Greer Nano Letters 2013 13 (11), 5703-5709
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43120
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:20 Dec 2013 23:25
Last Modified:09 Sep 2015 23:15

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