A1 Journal article (refereed)
Influence of B content on microstructure, phase composition and mechanical properties of CVD Ti(B,N) coatings (2022)
Tkadletz, M., Schalk, N., Lechner, A., Hatzenbichler, L., Holec, D., Hofer, C., Deluca, M., Sartory, B., Lyapin, A., Julin, J., & Czettl, C. (2022). Influence of B content on microstructure, phase composition and mechanical properties of CVD Ti(B,N) coatings. Materialia, 21, Article 101323. https://doi.org/10.1016/j.mtla.2022.101323
JYU authors or editors
Publication details
All authors or editors: Tkadletz, Michael; Schalk, Nina; Lechner, Alexandra; Hatzenbichler, Lukas; Holec, David; Hofer, Christina; Deluca, Marco; Sartory, Bernhard; Lyapin, Andrey; Julin, Jaakko; et al.
Journal or series: Materialia
eISSN: 2589-1529
Publication year: 2022
Volume: 21
Article number: 101323
Publisher: Elsevier
Publication country: United Kingdom
Publication language: English
DOI: https://doi.org/10.1016/j.mtla.2022.101323
Publication open access: Openly available
Publication channel open access: Partially open access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/79811
Abstract
Within this work the effect of the B content on the microstructure, phase composition and mechanical properties of CVD Ti(B,N) coatings is investigated. Ti(B,N) coatings with B contents from 0 (fcc-TiN) to ∼5, ∼15, ∼30, ∼45 and 66 (h-TiB2) at.% have been deposited by CVD. The elemental composition of the coatings was confirmed by ERDA and their microstructure was investigated using XRD and SEM. With increasing B content, a transition from a fcc to a h-dominated structure via dual-phase fcc/h-Ti(B,N) was observed, which was accompanied by a decreasing grain size from the µm to nm range. Combinatorial use of Raman spectroscopy, XPS and APT measurements indicated B-rich grain boundary segregations and the formation of increasing amounts of h-Ti(B,N)2 clusters embedded within an fcc-Ti(B,N) matrix up to B contents of ∼30 at.%, while for ∼45 at.% B the matrix was predominantly composed of h-Ti(B,N)2. Complementary ab initio calculations predicting the phase formation confirmed the interpretation of the experimental results. In terms of the mechanical properties, nanoindentation measurements and micromechanical testing revealed a rise in hardness from ∼18 to ∼41 GPa and an increasing fracture stress and toughness from ∼7 to ∼13 GPa and ∼4.6 to ∼5.5 MPam1/2, respectively, by increasing the B content up to ∼30 at.%. In contrast, a significant drop in hardness, fracture stress and fracture toughness was observed at ∼45 at.% B. Thus it can be concluded, that both h-TiB2 and dual-phase fcc/h-Ti(B,N) coatings with maximized B content yield superior properties over TiN and consequently improved performance.
Keywords: surfacings (matter); microstructures; physical properties; titanium; borides; chemical vapour deposition
Free keywords: Ti(B,N); chemical vapor deposition (CVD); borides; atom probe tomography (APT); micromechanics
Contributing organizations
Ministry reporting: Yes
Reporting Year: 2022
JUFO rating: 1