Influence of B content on microstructure, phase composition and mechanical properties of CVD Ti(B,N) coatings

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Influence of B content on microstructure, phase composition and mechanical properties of CVD Ti(B,N) coatings. / Tkadletz, Michael; Schalk, Nina; Lechner, Alexandra et al.
In: Materialia, Vol. 21.2022, No. March, 101323, 10.01.2022.

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@article{7b75ef2806774748b5eb4d18063a4ad4,
title = "Influence of B content on microstructure, phase composition and mechanical properties of CVD Ti(B,N) coatings",
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-TiB 2) 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 MPam 1/2, 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-TiB 2 and dual-phase fcc/h-Ti(B,N) coatings with maximized B content yield superior properties over TiN and consequently improved performance. ",
author = "Michael Tkadletz and Nina Schalk and Alexandra Lechner and Lukas Hatzenbichler and David Holec and Christina Hofer and Marco Deluca and Bernhard Sartory and Andrey Lyapin and Jaakko Julin and Christoph Czettl",
note = "Publisher Copyright: {\textcopyright} 2022 The Author(s)",
year = "2022",
month = jan,
day = "10",
doi = "10.1016/j.mtla.2022.101323",
language = "English",
volume = "21.2022",
journal = "Materialia",
issn = "2589-1529",
publisher = "Elsevier",
number = "March",

}

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TY - JOUR

T1 - Influence of B content on microstructure, phase composition and mechanical properties of CVD Ti(B,N) coatings

AU - Tkadletz, Michael

AU - Schalk, Nina

AU - Lechner, Alexandra

AU - Hatzenbichler, Lukas

AU - Holec, David

AU - Hofer, Christina

AU - Deluca, Marco

AU - Sartory, Bernhard

AU - Lyapin, Andrey

AU - Julin, Jaakko

AU - Czettl, Christoph

N1 - Publisher Copyright: © 2022 The Author(s)

PY - 2022/1/10

Y1 - 2022/1/10

N2 - 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-TiB 2) 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 MPam 1/2, 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-TiB 2 and dual-phase fcc/h-Ti(B,N) coatings with maximized B content yield superior properties over TiN and consequently improved performance.

AB - 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-TiB 2) 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 MPam 1/2, 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-TiB 2 and dual-phase fcc/h-Ti(B,N) coatings with maximized B content yield superior properties over TiN and consequently improved performance.

UR - http://www.scopus.com/inward/record.url?scp=85122824506&partnerID=8YFLogxK

U2 - 10.1016/j.mtla.2022.101323

DO - 10.1016/j.mtla.2022.101323

M3 - Article

VL - 21.2022

JO - Materialia

JF - Materialia

SN - 2589-1529

IS - March

M1 - 101323

ER -