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Article: Tensile deformation of silver micro-wires of small thickness-to-grain-size ratios

TitleTensile deformation of silver micro-wires of small thickness-to-grain-size ratios
Authors
KeywordsCoupled effect
Dislocation densities
Dislocation microstructures
Grain size
Polycrystalline
Issue Date2012
PublisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/msea
Citation
Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, 2012, v. 539, p. 74-84 How to Cite?
AbstractA recent letter from us has indicated that the tensile proof strength of polycrystalline Ag micro-wires, with thicknesses in the range from 20 to 50. μm, depends strongly on the specimen size (t) and weakly on the grain size (d) when t/. d becomes smaller than about 3. In this work, we report further coupled effects of specimen size and grain size in the regime when their ratio is small. At a given grain size from 3 to 40. μm, the tensile elongation was found to decrease as the wire thickness decreases, and as the t/. d ratio gets smaller than about 3, the tensile elongation loses its dependence on the grain size. The work-hardening rate was found to scale approximately with the proof strength, and so they should be controlled by the same metallurgical factors. Transmission electron microscopy examination of the dislocation microstructures showed that in the regime where the grain size dominates strength and ductility, the dislocation density rises rapidly on deformation, but in the regime where the specimen thickness dominates strength and ductility, the dislocation density remains on the same order of magnitude as the undeformed state. The easy escape of dislocations from the specimen is thought to be the reason for the observed size effect of strength. © 2012 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/145894
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.803
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of the Hong Kong Special Administration Region, PR ChinaHKU7159/10E
Funding Information:

We thank Dr. George Greene for providing the Ag wire. The work described in this paper was supported by a grant from the Research Grants Council of the Hong Kong Special Administration Region, PR China (Project No. HKU7159/10E).

 

DC FieldValueLanguage
dc.contributor.authorChen, XXen_US
dc.contributor.authorNgan, AHWen_US
dc.date.accessioned2012-03-27T09:01:08Z-
dc.date.available2012-03-27T09:01:08Z-
dc.date.issued2012en_US
dc.identifier.citationMaterials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, 2012, v. 539, p. 74-84en_US
dc.identifier.issn0921-5093-
dc.identifier.urihttp://hdl.handle.net/10722/145894-
dc.description.abstractA recent letter from us has indicated that the tensile proof strength of polycrystalline Ag micro-wires, with thicknesses in the range from 20 to 50. μm, depends strongly on the specimen size (t) and weakly on the grain size (d) when t/. d becomes smaller than about 3. In this work, we report further coupled effects of specimen size and grain size in the regime when their ratio is small. At a given grain size from 3 to 40. μm, the tensile elongation was found to decrease as the wire thickness decreases, and as the t/. d ratio gets smaller than about 3, the tensile elongation loses its dependence on the grain size. The work-hardening rate was found to scale approximately with the proof strength, and so they should be controlled by the same metallurgical factors. Transmission electron microscopy examination of the dislocation microstructures showed that in the regime where the grain size dominates strength and ductility, the dislocation density rises rapidly on deformation, but in the regime where the specimen thickness dominates strength and ductility, the dislocation density remains on the same order of magnitude as the undeformed state. The easy escape of dislocations from the specimen is thought to be the reason for the observed size effect of strength. © 2012 Elsevier B.V.-
dc.languageengen_US
dc.publisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/mseaen_US
dc.relation.ispartofMaterials Science and Engineering A: Structural Materials: Properties, Microstructures and Processingen_US
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Materials Science and Engineering A. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, 2012, v. 539, p. 74-84. DOI: 10.1016/j.msea.2012.01.054-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectCoupled effect-
dc.subjectDislocation densities-
dc.subjectDislocation microstructures-
dc.subjectGrain size-
dc.subjectPolycrystalline-
dc.titleTensile deformation of silver micro-wires of small thickness-to-grain-size ratiosen_US
dc.typeArticleen_US
dc.identifier.emailNgan, AHW: hwngan@hkucc.hku.hken_US
dc.identifier.authorityNgan, AHW=rp00225en_US
dc.description.naturepostprint-
dc.identifier.doi10.1016/j.msea.2012.01.054-
dc.identifier.scopuseid_2-s2.0-84862790088-
dc.identifier.hkuros198999en_US
dc.identifier.volume539en_US
dc.identifier.spage74en_US
dc.identifier.epage84en_US
dc.identifier.isiWOS:000302047300012-
dc.publisher.placeSwitzerland-
dc.identifier.citeulike10429927-

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