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Article: Microstructure versus flaw: Mechanisms of failure and strength in nanostructures

TitleMicrostructure versus flaw: Mechanisms of failure and strength in nanostructures
Authors
Keywordsmolecular dynamics
nanocrystalline
mechanical properties
fracture
Size effect
Issue Date2013
Citation
Nano Letters, 2013, v. 13, n. 11, p. 5703-5709 How to Cite?
AbstractUnderstanding 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. © 2013 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/303415
ISSN
2023 Impact Factor: 9.6
2023 SCImago Journal Rankings: 3.411
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorGu, X. Wendy-
dc.contributor.authorWu, Zhaoxuan-
dc.contributor.authorZhang, Yong Wei-
dc.contributor.authorSrolovitz, David J.-
dc.contributor.authorGreer, Julia R.-
dc.date.accessioned2021-09-15T08:25:15Z-
dc.date.available2021-09-15T08:25:15Z-
dc.date.issued2013-
dc.identifier.citationNano Letters, 2013, v. 13, n. 11, p. 5703-5709-
dc.identifier.issn1530-6984-
dc.identifier.urihttp://hdl.handle.net/10722/303415-
dc.description.abstractUnderstanding 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. © 2013 American Chemical Society.-
dc.languageeng-
dc.relation.ispartofNano Letters-
dc.subjectmolecular dynamics-
dc.subjectnanocrystalline-
dc.subjectmechanical properties-
dc.subjectfracture-
dc.subjectSize effect-
dc.titleMicrostructure versus flaw: Mechanisms of failure and strength in nanostructures-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/nl403453h-
dc.identifier.pmid24168654-
dc.identifier.scopuseid_2-s2.0-84887852495-
dc.identifier.volume13-
dc.identifier.issue11-
dc.identifier.spage5703-
dc.identifier.epage5709-
dc.identifier.eissn1530-6992-
dc.identifier.isiWOS:000327111700111-

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