Hirle, Anna Viktoria

Fuger, Christoph

Hahn, Rainer

Kutrowatz, Philip

Weiss, Maximilian

Limbeck, Andreas

Hunold, Oliver

Polcik, Peter

Riedl-Tragenreif, Helmut

2023-01-05T10:31:56Z

2023-01-05T10:31:56Z

2022-10-05

<div class="csl-bib-body"> <div class="csl-entry">Hirle, A. V., Fuger, C., Hahn, R., Kutrowatz, P., Weiss, M., Limbeck, A., Hunold, O., Polcik, P., &#38; Riedl-Tragenreif, H. (2022, October 5). <i>Mechanical Properties and Fracture Behavior of TiB2+z Thin Films</i> [Poster Presentation]. Nanomechanical Testing in Materials Research and Development VIII (Split), Split, Croatia. http://hdl.handle.net/20.500.12708/139365</div> </div>

http://hdl.handle.net/20.500.12708/139365

Hexagonal transition metal diborides are promising candidates for future protective coating materials as they exhibit an interesting mix of properties, i.e., high melting temperature, high hardness (~ 40 GPa), and excellent thermal stability. However, a significant drawback is their inherent brittleness, limiting possible long-term applications due to premature failure and subsequent environmental attacks. Within this study, we want to describe the fracture characteristics of physical vapor deposited titanium diboride thin films in more detail. We synthesized DC magnetron sputtered TiB2+z with a broad variation in boron contents (TiB2.07 to TiB4.42) and investigated their elemental composition, morphology, and mechanical properties (hardness, Young's modulus, and fracture toughness). According to the literature, the boron-rich tissue phase is important regarding the mechanical properties of over-stochiometric TiB2+z thin films [1].TEM investigations verified the presence of tissue phase and a decrease in grain size with increasing boron concentration. Furthermore, structural analysis confirmed the apparent correlation between the deposition pressure and a preferred texture within the TiB2+z thin films. To gain maximum hardness values (~40 GPa), a (0001) orientation (in growth direction) is essential, whereas for ("10" "1" ̅"1" ) and (1000) oriented coatings, we observed a decrease in hardness of about 10 GPa. This strong anisotropic behavior (concerning active slip events) of hexagonal diborides was theoretically confirmed for ZrB2 and TiB2 and experimentally for WB2-z based thin films [2-4]. We conducted in-situ cantilever bending tests to determine the intrinsic fracture toughness – excluding possible substrate influences. These experiments revealed an almost linear decrease in fracture toughness from KIC = 3.02 ± 0.13 MPa√m for TiB2.43 to KIC = 2.51 ± 0.14 MPa√m for TiB4.42. We attribute this decrease, accompanied by a reduction in hardness, to the negative impact of excess boron (tissue phase). In summary, our results highlight the impact of texture and morphological design on the mechanical properties of TiB2+z based coatings. The 0001 texture emerged to be dominant concerning the hardness, whereas the constitution of the tissue phase mainly influences the fracture toughness. References [1] P. H. Mayrhofer, C. Mitterer, J. G. Wen, J. E. Greene, and I. Petrov, “Self-organized nanocolumnar structure in superhard TiB2 thin films,” Appl. Phys. Lett., vol. 86, no. 13, p. 131909, 2005, doi: 10.1063/1.1887824. [2] B. Hunter et al., “Investigations into the slip behavior of zirconium diboride,” J. Mater. Res., vol. 31, no. 18, pp. 2749–2756, 2016, doi: 10.1557/jmr.2016.201. [3] S. Guo and H. Sun, “Superhardness Induced by Grain Boundary Vertical Sliding in (001)-textured ZrB 2 and TiB 2 Nano Films,” Acta Materialia, vol. 218, p. 117212, 2021, doi: 10.1016/j.actamat.2021.117212. [4] C. Fuger et al., “Anisotropic super-hardness of hexagonal WB 2± z thin films,” Materials Research Letters, vol. 10, no. 2, pp. 70–77, 2022, doi: 10.1080/21663831.2021.2021308.

CDG Christian Doppler Forschungsgesellschaft

en

Thin films

Physical Vapor Deposition

Micromechanical testing

Fracture toughness

Diborides

Mechanical Properties and Fracture Behavior of TiB2+z Thin Films

Presentation

Vortrag

Oerlikon (Liechtenstein), Liechtenstein

Plansee (Germany), Germany

CDL-SEC

Poster Presentation

Oberflächentechnik von hochbeanspruchten Präzisionskomponenten

Röntgenzentrum

Universitäre Service-Einrichtung für Transmissionselektronenmikroskopie

M2

M1

Materials Characterization

Surfaces and Interfaces

50

50

https://engconf.us/wp-content/uploads/2022/09/Final-Program-WEB-21-AN-1.pdf

E308-01-2 - Forschungsgruppe Angewandte Oberflächentechnik

E164-04-1 - Forschungsgruppe Elektrochemische Energieumwandlung

E164-01-2 - Forschungsgruppe Oberflächen-, Spurenanalytik und Chemometrie

0000-0003-0345-6962

0000-0003-2685-4808

0000-0002-4312-9256

0000-0001-5042-2445

0000-0003-3111-0029

0000-0002-8108-1185

Nanomechanical Testing in Materials Research and Development VIII (Split)

02-10-2022

07-10-2022

On Site

Event for scientific audience

Split

HR

Hirle, Anna Viktoria

Nanotechnologie

Werkstofftechnik

2100

2050

50

50

none

http://purl.org/coar/resource_type/c_18co

conference poster not in proceedings

Publications

no Fulltext

en

E308-01-2 - Forschungsgruppe Angewandte Oberflächentechnik

E308-01-2 - Forschungsgruppe Angewandte Oberflächentechnik

E308-01-2 - Forschungsgruppe Angewandte Oberflächentechnik

E308-01-2 - Forschungsgruppe Angewandte Oberflächentechnik

E164-04-1 - Forschungsgruppe Elektrochemische Energieumwandlung

E164-01-2 - Forschungsgruppe Oberflächen-, Spurenanalytik und Chemometrie

Oerlikon (Liechtenstein)

E308-01-2 - Forschungsgruppe Angewandte Oberflächentechnik

0000-0003-0345-6962

0000-0003-2685-4808

0000-0002-7322-8108

0000-0002-4312-9256

0000-0001-5042-2445

0000-0003-3111-0029

0000-0002-8108-1185

E308-01 - Forschungsbereich Werkstoffwissenschaft

E308-01 - Forschungsbereich Werkstoffwissenschaft

E308-01 - Forschungsbereich Werkstoffwissenschaft

E308-01 - Forschungsbereich Werkstoffwissenschaft

E164-04 - Forschungsbereich Technische Elektrochemie

E164-01 - Forschungsbereich Imaging und Instrumentelle Analytische Chemie

E308-01 - Forschungsbereich Werkstoffwissenschaft

Christian Doppler Forschungsgesells

CDL-SEC