<div class="csl-bib-body">
<div class="csl-entry">Hirle, A. V., Fuger, C., Hahn, R., Wojcik, T., Kutrowatz, P., Weiss, M., Hunold, O., Polcik, P., & Riedl-Tragenreif, H. (2023, May 24). <i>Tissue Phase Affected Fracture Toughness of Nano-Columnar TiB2+z Thin Films</i> [Conference Presentation]. 49th International Conference on Metallurgical Coatings & Thin Films 2023, San Diego, United States of America (the). http://hdl.handle.net/20.500.12708/189996</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/189996
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dc.description
[1] C. Mitterer, PVD and CVD Hard Coatings, in: Comprehensive Hard Materials, Elsevier, 2014: pp. 449–467.
[2] H. Blom et al., Reactively sputtered titanium boride thin films, J. Vac. Sci. Technol. A. 7 (1989) 162–165.
[3] H. Holleck, Material selection for hard coatings, J. Vac. Sci. Technol. A. 4 (1986) 2661–2669.
[4] P.H. Mayrhofer et al., Self-organized nanocolumnar structure in superhard TiB2 thin films, Appl. Phys. Lett. 86 (2005) 131909.
[5] C. Fuger et al., Revisiting the origins of super-hardness in TiB2+z thin films – Impact of growth conditions and anisotropy, Surf. Coat. Technol. (2022) 128806.
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dc.description.abstract
Despite being intensively investigated and already established in industry as protective coatings for aluminium machining [1] or diffusion barriers [2], Titanium-Diboride (TiB2) is still not fully understood. In particular, for the fracture behaviour and the corresponding material characteristic (intrinsic fracture toughness, KIC) the literature presents only little descriptions. So far it is known that the mechanical properties (H and E) of TiB2 are highly dependent on the crystal orientation [3] and the amount of tissue phase present [4], which in turn can be influenced by the choice of coating parameters. To figure out, if this also affects the fracture behaviour, we synthesized a broad stoichiometric variation from TiB2.07 up to TiB4.42 by DC magnetron sputtering and thoroughly determined their structural, morphological and mechanical properties. By using micro-mechanical test set-ups (in-situ microcantilever bending tests) the intrinsic fracture toughness was investigated in relation to the chemical and hence morphological variation. In addition, information about the stress states within the thin films were obtained by nanobeam (synchrotron) experiments. The presence of a B-rich tissue phase was confirmed by HR-TEM analysis, showing that the grain size is decreasing with increasing B content, which is accompanied by an increase in tissue phase fraction. The dominance of the tissue phase is progressing with increasing B, also forcing smaller column sizes (from ~10 to < 5 nm) [5]. A change in Boron content from TiB2.22 to TiB4.42 leads to a decrease in fracture toughness from 3.55 ± 0.16 MPa√m to 2.51 ± 0.14 MPa√m of these superhard films. In summary, this study underlines the influence of stoichiometry and the potential of tissue phase engineering on the mechanical properties of TiB2+z based thin films.
en
dc.description.sponsorship
Christian Doppler Forschungsgesells
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dc.language.iso
en
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dc.subject
TiB2
en
dc.subject
tissue phase
en
dc.subject
Fracture toughness
en
dc.subject
Transition metal diborides
en
dc.title
Tissue Phase Affected Fracture Toughness of Nano-Columnar TiB2+z Thin Films
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.contributor.affiliation
Oerlikon (Liechtenstein), Liechtenstein
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dc.contributor.affiliation
Plansee (Germany), Germany
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dc.relation.grantno
CDL-SEC
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dc.type.category
Conference Presentation
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tuw.project.title
Oberflächentechnik von hochbeanspruchten Präzisionskomponenten
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tuw.researchinfrastructure
Röntgenzentrum
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tuw.researchinfrastructure
Universitäre Service-Einrichtung für Transmissionselektronenmikroskopie
