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Decomposition routes and strain evolution in arc deposited TiZrAlN coatings
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, Faculty of Science & Engineering.
Seco Tools AB, Sweden.ORCID iD: 0000-0003-4577-0976
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-5670-7644
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
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2019 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 779, p. 261-269Article in journal (Refereed) Published
Abstract [en]

Phase, microstructure, and strain evolution during annealing of arc deposited TiZrAlN coatings are studied using in situ x-ray scattering and ex situ transmission electron microscopy. We find that the decomposition route changes from nucleation and growth of wurtzite AlN to spinodal decomposition when the Zr-content is decreased and the Al-content increases. Decomposition of Ti0.31Zr0.24Al0.45N results in homogeneously distributed wurtzite AlN grains in a cubic, dislocation-dense matrix of TiZrN consisting of domains of different chemical composition. The combination of high dislocation density, variation of chemical composition within the cubic grains, and evenly distributed wurtzite AlN grains results in high compressive strains, -1.1%, which are retained after 3 h at 1100 degrees C. In coatings with higher Zr-content, the strains relax during annealing above 900 degrees C due to grain growth and defect annihilation. (C) 2018 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2019. Vol. 779, p. 261-269
Keywords [en]
Ti-Zr-Al-N; Hard coatings; Thermal stability; Strain evolution
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:liu:diva-154526DOI: 10.1016/j.jallcom.2018.11.039ISI: 000457154700032OAI: oai:DiVA.org:liu-154526DiVA, id: diva2:1290547
Note

Funding Agencies|VINNOVA (Swedish Governmental Agency for Innovation Systems) [2016-05156]; Swedish Government Strategic Research Area (SFO Mat LiU) [2009 00971]; Swedish Research Council [2017-03813]; Rontgen-Angstrom Cluster frame grants [VR 2011-6505, VR 2017-06701]

Available from: 2019-02-20 Created: 2019-02-20 Last updated: 2019-05-07
In thesis
1. Theoretical and experimental studies of ternary and quaternary nitrides for machining and thermoelectric materials
Open this publication in new window or tab >>Theoretical and experimental studies of ternary and quaternary nitrides for machining and thermoelectric materials
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Teoretiska och experimentella studier av ternära och kvarternära nitrider för metallbearbetning och termoelektriska material
Abstract [en]

Nitrides are used as coatings and thin films for a wide range of applications. The study and use of nitrides in the recent decades have shifted towards ternary, quaternary or even higher order (complex) nitrides. There is an interest to use ternary and quaternary nitrides for machining and thermoelectric materials, because it gives the possibility to choose composition and thereby design the materials properties. This thesis presents research results on TiAlN and and TiAlN-based coatings that are used as hard coatings for machining and on ternary scandium nitrides that are of interest for thin films for thermoelectric applications. The high-pressure high-temperature behavior of cubic TiAlN deposited on cubic boron nitride has been experimentally studied. It has been shown that the spinodal decomposition, which means decomposition into cubic domains enriched in TiN and AlN, is delayed as a result of high pressure compared to ambient pressure. No chemical interaction between coating and substrate occurs. TiZrAlN has been theoretically and experimentally studied at high temperature. The results show that the when Zr-content is decreased and the Al-content is increased the decomposition route changes from nucleation and growth to spinodal decomposition. The microstructure evolution with temperature depends on the initial composition. In the case where the decompositon starts with only spinodal decomposition the microstructure at 1100 °C consists of domains that are larger than in the case where the decomposition occurs by nucleation and growth. ScMN2 (M=V, Nb, Ta) phases have been experimentally demonstrated for M=Nb and Ta in a few studies, but have not been much investigated. In this theseis, their crystal structure, stability, elastic properties, electronic structure and thermoelectric properties have been studied. At 0 K and 0 GPa it has been shown that these three phases are thermodynamically and elastically stable. Additionally, these are narrow-bandgap semiconductors and their thermoelectric properties can be tuned by doping. Pressure has a stabilizing effect on these structures. When pressure increases from 0-150 GPa the elastic constants and moduli increases in the range 53-317 %.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2019. p. 50
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1983
Keywords
materials science; thin film physics; nitrides, machining; thermoelectrics, materialvetenskap; tunnfilmsfysik; nitrider; metallbearbetning; termoelektricitet
National Category
Condensed Matter Physics Ceramics Other Materials Engineering
Identifiers
urn:nbn:se:liu:diva-155101 (URN)10.3384/diss.diva-155101 (DOI)9789176851142 (ISBN)
Public defence
2019-06-05, Planck, Fysikhuset, Campus Valla, Linköping, 10:15 (English)
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Supervisors
Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-10-16Bibliographically approved

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The full text will be freely available from 2020-11-14 12:11
Available from 2020-11-14 12:11

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Johansson, Mats P.

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