Amorphization of graphite flakes in gray cast iron under tribological load

A gray cast iron disc, which had been submitted to a heavy duty automotive brake test, was examined with energy filtered transmission electron microscopy. A graphite flake in a convenient angular position showed the shear interaction of graphite layers with the iron matrix in nano-scale resolution....

Full description

Bibliographic Details
Authors: Hinrichs, Ruth, Vasconcellos, Marcos Antonio Zen, Oesterle, Werner, Prietzel, Claudia
Format: article
Status:Published version
Publication Date:2018
Country:Brasil
Institution:Universidade Federal do Rio Grande do Sul (UFRGS)
Repository:Repositório Institucional da UFRGS
Language:English
OAI Identifier:oai:www.lume.ufrgs.br:10183/180779
Online Access:http://hdl.handle.net/10183/180779
Access Level:Open access
Keyword:Grafite
Espectroscopia Raman
Microscopia eletrônica
Cisalhamento
Graphite
Shear load
Amorphization
EFTEM
Raman spectroscopy
id BR_fcbd9f830057f6ed7dceffafdb48bcbe
oai_identifier_str oai:www.lume.ufrgs.br:10183/180779
network_acronym_str BR
network_name_str Brasil
repository_id_str
spelling 2018-07-28T02:46:31Z20181516-1439http://hdl.handle.net/10183/180779001069161A gray cast iron disc, which had been submitted to a heavy duty automotive brake test, was examined with energy filtered transmission electron microscopy. A graphite flake in a convenient angular position showed the shear interaction of graphite layers with the iron matrix in nano-scale resolution. Atomic layers of graphite were wedged into the ferritic bulk, allowing the entrance of oxygen and the subsequent formation of magnetite. The exfoliated few-layer graphene batches deformed heavily when forced into the matrix. When Raman spectra from the disc surface, which show distinctive carbonaceous bands, were compared with Raman spectra from graphite subjected to deformation in a shaker mill with different milling times, it could be seen that the shear stress on the brake surface was much more effective to induce disorder than the milling, where compressive and impact forces had been additionally exerted on the sample. During shear load the high anisotropy of elastic modulus in the graphite crystalline structure and the low adhesion between graphite basal planes allowed the exfoliation of wrinkled few-layer grapheme batches, causing the formation of more defect related Raman bands than the mechanical stress during high-energy milling.application/pdfengMaterials research : ibero-american journal of materials. São Carlos, SP. Vol. 21, n. 4 (maio 2018), e20171000, 6p.GrafiteEspectroscopia RamanMicroscopia eletrônicaCisalhamentoGraphiteShear loadAmorphizationEFTEMRaman spectroscopyAmorphization of graphite flakes in gray cast iron under tribological loadinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSHinrichs, RuthVasconcellos, Marcos Antonio ZenOesterle, WernerPrietzel, ClaudiaORIGINAL001069161.pdfTexto completo (inglês)application/pdf2806391http://www.lume.ufrgs.br/bitstream/10183/180779/1/001069161.pdf976f3074a1876e0096f3045e77bea31bMD51TEXT001069161.pdf.txt001069161.pdf.txtExtracted Texttext/plain20083http://www.lume.ufrgs.br/bitstream/10183/180779/2/001069161.pdf.txt6a15f24840019e02a96c59e3ebb6d3aaMD52THUMBNAIL001069161.pdf.jpg001069161.pdf.jpgGenerated Thumbnailimage/jpeg2158http://www.lume.ufrgs.br/bitstream/10183/180779/3/001069161.pdf.jpg63394897471652f1e40b750fb027a4cfMD5310183/1807792022-04-20 04:55:18.088274oai:www.lume.ufrgs.br:10183/180779Repositório InstitucionalPUBhttps://lume.ufrgs.br/oai/requestlume@ufrgs.bropendoar:2022-04-20T07:55:18Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Amorphization of graphite flakes in gray cast iron under tribological load
title Amorphization of graphite flakes in gray cast iron under tribological load
spellingShingle Amorphization of graphite flakes in gray cast iron under tribological load
Hinrichs, Ruth
Grafite
Espectroscopia Raman
Microscopia eletrônica
Cisalhamento
Graphite
Shear load
Amorphization
EFTEM
Raman spectroscopy
title_short Amorphization of graphite flakes in gray cast iron under tribological load
title_full Amorphization of graphite flakes in gray cast iron under tribological load
title_fullStr Amorphization of graphite flakes in gray cast iron under tribological load
title_full_unstemmed Amorphization of graphite flakes in gray cast iron under tribological load
title_sort Amorphization of graphite flakes in gray cast iron under tribological load
dc.creator.none.fl_str_mv Hinrichs, Ruth
Vasconcellos, Marcos Antonio Zen
Oesterle, Werner
Prietzel, Claudia
author Hinrichs, Ruth
author_facet Hinrichs, Ruth
Vasconcellos, Marcos Antonio Zen
Oesterle, Werner
Prietzel, Claudia
author_role author
author2 Vasconcellos, Marcos Antonio Zen
Oesterle, Werner
Prietzel, Claudia
author2_role author
author
author
dc.subject.por.fl_str_mv Grafite
Espectroscopia Raman
Microscopia eletrônica
Cisalhamento
topic Grafite
Espectroscopia Raman
Microscopia eletrônica
Cisalhamento
Graphite
Shear load
Amorphization
EFTEM
Raman spectroscopy
dc.subject.eng.fl_str_mv Graphite
Shear load
Amorphization
EFTEM
Raman spectroscopy
description A gray cast iron disc, which had been submitted to a heavy duty automotive brake test, was examined with energy filtered transmission electron microscopy. A graphite flake in a convenient angular position showed the shear interaction of graphite layers with the iron matrix in nano-scale resolution. Atomic layers of graphite were wedged into the ferritic bulk, allowing the entrance of oxygen and the subsequent formation of magnetite. The exfoliated few-layer graphene batches deformed heavily when forced into the matrix. When Raman spectra from the disc surface, which show distinctive carbonaceous bands, were compared with Raman spectra from graphite subjected to deformation in a shaker mill with different milling times, it could be seen that the shear stress on the brake surface was much more effective to induce disorder than the milling, where compressive and impact forces had been additionally exerted on the sample. During shear load the high anisotropy of elastic modulus in the graphite crystalline structure and the low adhesion between graphite basal planes allowed the exfoliation of wrinkled few-layer grapheme batches, causing the formation of more defect related Raman bands than the mechanical stress during high-energy milling.
publishDate 2018
dc.date.accessioned.fl_str_mv 2018-07-28T02:46:31Z
dc.date.issued.fl_str_mv 2018
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/other
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/180779
dc.identifier.issn.pt_BR.fl_str_mv 1516-1439
dc.identifier.nrb.pt_BR.fl_str_mv 001069161
identifier_str_mv 1516-1439
001069161
url http://hdl.handle.net/10183/180779
dc.language.iso.fl_str_mv eng
language eng
dc.relation.ispartof.pt_BR.fl_str_mv Materials research : ibero-american journal of materials. São Carlos, SP. Vol. 21, n. 4 (maio 2018), e20171000, 6p.
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFRGS
instname:Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
instname_str Universidade Federal do Rio Grande do Sul (UFRGS)
instacron_str UFRGS
institution UFRGS
reponame_str Repositório Institucional da UFRGS
collection Repositório Institucional da UFRGS
bitstream.url.fl_str_mv http://www.lume.ufrgs.br/bitstream/10183/180779/1/001069161.pdf
http://www.lume.ufrgs.br/bitstream/10183/180779/2/001069161.pdf.txt
http://www.lume.ufrgs.br/bitstream/10183/180779/3/001069161.pdf.jpg
bitstream.checksum.fl_str_mv 976f3074a1876e0096f3045e77bea31b
6a15f24840019e02a96c59e3ebb6d3aa
63394897471652f1e40b750fb027a4cf
bitstream.checksumAlgorithm.fl_str_mv MD5
MD5
MD5
repository.name.fl_str_mv Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)
repository.mail.fl_str_mv lume@ufrgs.br
_version_ 1853675818522247168
score 15,301603

Similar Items