<div class="csl-bib-body">
<div class="csl-entry">Posch, G. (2020). <i>Microstructural evolution in dry and lubricated CuNi sliding contacts - an experimental approach</i> [Diploma Thesis, Technische Universität Wien]. reposiTUm. https://doi.org/10.34726/hss.2020.76404</div>
</div>
-
dc.identifier.uri
https://doi.org/10.34726/hss.2020.76404
-
dc.identifier.uri
http://hdl.handle.net/20.500.12708/1059
-
dc.description
Abweichender Titel nach Übersetzung der Verfasserin/des Verfassers
-
dc.description.abstract
Friction and wear of polycrystalline materials are linked to the microstructural response given to interfacial stresses. Even though most of the governing mechanisms of microstructural evolution in sliding contacts are generally understood, it is still uncertain which mechanisms matter under which conditions. For that reason, several studies were carried out over the years to investigate the microstructure and simulate the dislocation dynamics in the near surface zones during sliding. An attempt was made by Eder et al. to derive a deformation mechanism map for CuNi alloys, by analyzing deformation mechanisms such as twinning, time-dependent grain size development and shear in several fcc CuNi alloys subjected to sliding with molecular dynamics (MD) simulation. The motivation of the present study is to experimentally verify the predictions of this deformation mechanism map. The map has defined five distinct regions according to the dominant deformation mode of the structure: (1) elastic deformation; (2) twinning and grain refinement; (3) more twinning with grain boundary driven processes; (4) shear layer formation beside massive twinning; and (5) surface shearing. The microstructural evolution of CuNi alloys under distinct loading conditions was investigated. Experiments were conducted on pure Cu, CuNi10, CuNi30 and pure Ni probes in dry and lubricated reciprocating sliding contact. For the friction tests, the parameters were chosen similar as possible to those in the MD simulation. All test were conducted at room temperature (22C) and in an argon atmosphere to reduce oxidation. Exceptions are only the lubricated measurements and those conducted at low normal pressure. Friction curves were analysed and the friction surfaces were carefully examined using scanning electron microscopy (SEM) after friction. Cross-sectioning of the specimens after the friction tests were performed in the transverse direction (perpendicular to the direction of friction) in the middle of the track using a focused ion beam (FIB). The cross-sectional microstructure was analysed using a SEM/FIB dual-beam microscope. This deformation map may serve as a tool for finding optimum material compositions within a specified operating range.
en
dc.language
English
-
dc.language.iso
en
-
dc.rights.uri
http://rightsstatements.org/vocab/InC/1.0/
-
dc.subject
microstructural evolution
en
dc.subject
CuNi alloys
en
dc.subject
sliding contacts
en
dc.subject
friction
en
dc.title
Microstructural evolution in dry and lubricated CuNi sliding contacts - an experimental approach
en
dc.title.alternative
Mikrostrukturentwicklung in trockenen und geschmierten CuNi Gleitkontakten - ein experimenteller Zugang
de
dc.type
Thesis
en
dc.type
Hochschulschrift
de
dc.rights.license
In Copyright
en
dc.rights.license
Urheberrechtsschutz
de
dc.identifier.doi
10.34726/hss.2020.76404
-
dc.contributor.affiliation
TU Wien, Österreich
-
dc.rights.holder
Gyöngyi Posch
-
dc.publisher.place
Wien
-
tuw.version
vor
-
tuw.thesisinformation
Technische Universität Wien
-
tuw.publication.orgunit
E307 - Institut für Konstruktionswissenschaften und Produktentwicklung