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Spinodal decomposition of Ti0.33Al0.67N thin films studied by atom probe tomography
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Chalmers University of Technology.
Chalmers University of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2286-5588
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2012 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 520, no 13, 4362-4368 p.Article in journal (Refereed) Published
Abstract [en]

Details of the phase decomposition in NaCl-structure Ti0.33Al0.67N thin films deposited by cathodic arc evaporation are studied by atom probe tomography. We demonstrate that as-deposited films are in the earliest stage of decomposition for which electron microscopy and x-ray diffraction indicate a single-phase solid solution. Annealing at 900 degrees C further activates spinodal decomposition of the films, although pockets of unde-composed material remain after 2 h. N preferentially segregates to the AlN and TiN domains, causing the TiAlN matrix to be understoichiometric, by the energetics of N vacancies in TiAlN. The corresponding modulation in stoichiometry implies a Kirkendall effect, caused by different Al and Ti diffusivities.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 520, no 13, 4362-4368 p.
Keyword [en]
Titanium aluminum nitride, Spinodal decomposition, Atom probe tomography, Thin films
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-77325DOI: 10.1016/j.tsf.2012.02.085ISI: 000303084200023OAI: oai:DiVA.org:liu-77325DiVA: diva2:526344
Note

Funding Agencies|Swedish Research Council||VINN Excellence Center on Functional Nanoscale Materials||

Available from: 2012-05-11 Created: 2012-05-11 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Inside The Miscibility Gap: Nanostructuring and Phase Transformations in Hard Nitride Coatings
Open this publication in new window or tab >>Inside The Miscibility Gap: Nanostructuring and Phase Transformations in Hard Nitride Coatings
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is concerned with self-organization phenomena in hard and wear resistant transition-metal nitride coatings, both during growth and during post deposition thermal annealing. The uniting physical principle in the studied systems is the immiscibility of their constituent parts, which leads, under certain conditions, to structural variations on the nanoscale. The study of such structures is challenging, and during this work atom probe tomography (apt) was developed as a viable tool for their study. Ti0.33Al0.67N was observed to undergo spinodal decomposition upon annealing to 900 °C, by the use of apt in combination with electron microscopy. The addition of C to TiSiN was found to promote and refine the feather-like microstructure common in the system, with an ensuing decrease in thermal stability. An age-hardening of 36 % was measured in arc evaporated Zr0.44Al0.56N1.20, which was a nanocomposite of cubic, hexagonal, and amorphous phases. Magnetron sputtering of Zr0.64Al0.36N at 900 °C resulted in a self-organized and highly ordered growth of a two-dimensional two-phase labyrinthine structure of cubic ZrN and wurtzite AlN.The structure was analyzed and recovered by apt, although the ZrN phase suffered from severe trajectory aberrations, rendering only the Al signal useable.The initiation of the organized growth was found to occur by local nucleation at 5-8 nm from the substrate, before which random fluctuations in Al/Zr content increased steadily from the substrate. Finally, the decomposition of solid-solution TiB0.33N0.67 was found, by apt, to progress through the nucleation of TiB0.5N0.5 and TiN, followed by the transformation of the former into hexagonal TiB2.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2012. 69 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1472
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-84263 (URN)978-91-7519-809-5 (ISBN)
Public defence
2012-10-19, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
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Available from: 2012-10-03 Created: 2012-10-03 Last updated: 2016-08-31Bibliographically approved

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Johnson, LarsOdén, MagnusHultman, Lars

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