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Mechanisms of Failure in Nanoscale Metallic Glass

Gu, X. Wendy and Jafary-Zadeh, Mehdi and Chen, David Z. and Wu, Zhaoxuan and Zhang, Yong-Wei and Srolovitz, David J. and Greer, Julia R. (2014) Mechanisms of Failure in Nanoscale Metallic Glass. Nano Letters, 14 (10). pp. 5858-5864. ISSN 1530-6984. https://resolver.caltech.edu/CaltechAUTHORS:20140915-083240514

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Abstract

The emergence of size-dependent mechanical strength in nanosized materials is now well-established, but no fundamental understanding of fracture toughness or flaw sensitivity in nanostructures exists. We report the fabrication and in situ fracture testing of ∼70 nm diameter Ni–P metallic glass samples with a structural flaw. Failure occurs at the structural flaw in all cases, and the failure strength of flawed samples was reduced by 40% compared to unflawed samples. We explore deformation and failure mechanisms in a similar nanometallic glass via molecular dynamics simulations, which corroborate sensitivity to flaws and reveal that the structural flaw shifts the failure mechanism from shear banding to cavitation. We find that failure strength and deformation in amorphous nanosolids depend critically on the presence of flaws.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/nl5027869DOIArticle
http://pubs.acs.org/doi/abs/10.1021/nl5027869PublisherArticle
http://pubs.acs.org/doi/suppl/10.1021/nl5027869PublisherSupporting Information
ORCID:
AuthorORCID
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2014 American Chemical Society. Received: July 22, 2014; Revised: September 3, 2014; Publication Date (Web): September 8, 2014. X.W.G. thanks the National Defense Science and Engineering Graduate Fellowship, and D.Z.C. thanks the National Science Foundation Graduate Research Fellowship for financial support. J.R.G. acknowledges the National Science Foundation (DMR-1204864). The authors are very grateful to the Kavli Nanoscience Institute at Caltech for the availability of critical cleanroom facilities, Carol Garland for TEM assistance, Rachel Liontas for electroplating templates, and Boyu Fan and Timothy Tsang for help with electroplating. M.J.Z., Z.X.W., and Y.W.Z. 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) FellowshipUNSPECIFIED
NSF Graduate Research FellowshipUNSPECIFIED
NSFDMR-1204864
Agency for Science, Technology and Research (A*STAR)UNSPECIFIED
Subject Keywords:Size effect, metallic glass, notch sensitivity, flaw sensitivity, mechanical properties, fracture, molecular dynamics
Issue or Number:10
Record Number:CaltechAUTHORS:20140915-083240514
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140915-083240514
Official Citation:Mechanisms of Failure in Nanoscale Metallic Glass X. Wendy Gu, Mehdi Jafary-Zadeh, David Z. Chen, Zhaoxuan Wu, Yong-Wei Zhang, David J. Srolovitz, and Julia R. Greer Nano Letters 2014 14 (10), 5858-5864
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49685
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Sep 2014 16:32
Last Modified:03 Oct 2019 07:16

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