Repository logo
 
Publication

Nickel–carbon nanocomposites: Synthesis, structural changes and strengthening mechanisms

dc.contributor.authorNunes, D.
dc.contributor.authorVilarigues, M.
dc.contributor.authorCorreia, J.B.
dc.contributor.authorCarvalho, Patricia Almeida
dc.date.accessioned2013-02-26T15:32:15Z
dc.date.available2013-02-26T15:32:15Z
dc.date.issued2012
dc.description.abstractThe present work investigates Ni–nanodiamond and Ni–graphite composites produced by mechanical synthesis and subsequent heat treatments. Processing of nickel–carbon nanocomposites by this powder metallurgy route poses specific challenges, as carbon phases are prone to carbide conversion and amorphization. The processing window for carbide prevention has been established through X-ray diffraction by a systematic variation of the milling parameters. Transmission electron microscopy confirmed the absence of carbide and showed homogeneous particle distributions, as well as intimate bonding between the metallic matrix and the carbon phases. Ring diffraction patterns of chemically extracted carbon phases demonstrated that milled nanodiamond preserved crystallinity, while an essentially amorphous nature could be inferred for milled graphite. Raman spectra confirmed that nanodiamond particles remained largely unaffected by mechanical synthesis, whereas the bands of milled graphite were significantly changed into the typical amorphous carbon fingerprint. The results on the annealed nanocomposites showed that milling with Ni accelerated graphitization of the carbon phases during heat treatments at 973 and 1073 K in both composites. At the finer scales, the nanocomposites exhibited a remarkable microhardness enhancement (∼70%) compared with pure nanostructured nickel. The Hall–Petch relation and the Orowan–Ashby equation are used to discuss strengthening mechanisms and the load transfer ability to the reinforcing particles.por
dc.identifier.citationNunes, D.; Vilarigues, M.; Correia, J.B.; Carvalho, P.A. Nickel–carbon nanocomposites: Synthesis, structural changes and strengthening mechanisms. In: Acta Materialia, 2012, vol. 60, nº2, p.737-747por
dc.identifier.issn1359-6454
dc.identifier.urihttp://hdl.handle.net/10400.9/1662
dc.language.isoengpor
dc.publisherElsevierpor
dc.relation.publisherversionhttp://dx.doi.org/10.1016/j.actamat.2011.10.012por
dc.subjectNanocompositespor
dc.subjectNanodiamondpor
dc.subjectHall–Petch relationpor
dc.subjectMechanical synthesispor
dc.subjectCarbide formationpor
dc.titleNickel–carbon nanocomposites: Synthesis, structural changes and strengthening mechanismspor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage747por
oaire.citation.startPage737por
oaire.citation.titleActa Materialiapor
oaire.citation.volume60por
person.familyNameNunes
person.familyNameCorreia
person.familyNamecarvalho
person.givenNameDaniela
person.givenNameJose B.
person.givenNamepatricia
person.identifier.ciencia-idC118-38FB-6A57
person.identifier.ciencia-idC31C-D617-6377
person.identifier.ciencia-id021E-97A3-F128
person.identifier.orcid0000-0003-3115-6588
person.identifier.orcid0000-0002-8314-0695
person.identifier.orcid0000-0002-5447-0409
person.identifier.ridI-2734-2013
person.identifier.ridC-1150-2009
person.identifier.scopus-author-id26030595200
person.identifier.scopus-author-id7202364148
person.identifier.scopus-author-id7102859165
rcaap.rightsopenAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication6317af74-10da-4d1b-b413-028afabcf2c8
relation.isAuthorOfPublication51557bd3-14c6-4246-b185-36f668c061dd
relation.isAuthorOfPublicationf722bc06-dafc-4341-86f8-b405987804a8
relation.isAuthorOfPublication.latestForDiscovery51557bd3-14c6-4246-b185-36f668c061dd

Files

Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
JBCorreia_ActaMaterialia.pdf
Size:
157.5 KB
Format:
Adobe Portable Document Format
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description: