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Phase Transformation of Ti(B,N) into TiB2 and TiN Studied by Atom Probe Tomography
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Montan University Leoben, Austria.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-9140-6724
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2837-3656
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

The phase transformation of supersaturated solid-solution cubic (c) Ti0.57(B0.28N0.72)0.43 thin films into the equilibrium phases TiN and TiB2 has been studied by a combination of X-ray diffraction, transmission electron microscopy, and atom probe tomography. The transformation was found to progress through nucleation and growth, first of TiN and c-TiB0.5N0.5, followed by transformation of the B-rich precipitates to TiB2. The two-step process is interpreted as Guinier-Preston zone formation due to the incoherency between c-TiN and hexagonal TiB2. The nucleation was furthermore observed to be unclassical, with non-equilibrium compositions and extensive interfacial regions in the nuclei.

National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-84260OAI: oai:DiVA.org:liu-84260DiVA: diva2:558396
Available from: 2012-10-03 Created: 2012-10-03 Last updated: 2016-08-31Bibliographically 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)
Opponent
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Available from: 2012-10-03 Created: 2012-10-03 Last updated: 2016-08-31Bibliographically approved

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Johnson, LarsPersson, PerHultman, Lars

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