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Microstructural anisotropy effects on the metal cutting performance of decomposed arc evaporated Ti1-xAlxN coatings
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
Seco Tools AB, Fagersta, Sweden.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

The spinodal decomposition of cathodic arc evaporated cubic phase c-Ti0.34Al0.66N and c-Ti0.60Al0.40N coatings have been studied before and after continuous turning. By means of analytical transmission electron microscopy, we find that the evolving microstructure of c-Ti0.34Al0.66N, as simultaneously being exposed to high temperature of about 900 °C and high pressure of about 2.5 GPa, spinodally decompose into a spatially periodic, highly oriented and modulated interconnected array of coherent cubic AlN and cubic TiN rich regions along elastic compliant <100> crystal directions. Ti0.60Al0.40N instead decomposes into AlN and TiN rich domains in a more rounded and random microstructure. These effects are both explained by the elastic anisotropy which has earlier been shown to scale with Al content. The different evolving microstructure will lead to a different strengthening mechanism in the coatings during metal cutting and heat treatments, thus a different hardness and wear resistance behaviour.

National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-78829OAI: oai:DiVA.org:liu-78829DiVA: diva2:536095
Available from: 2012-06-21 Created: 2012-06-21 Last updated: 2013-10-02Bibliographically approved
In thesis
1. High pressure and high temperature behavior of TiAlN
Open this publication in new window or tab >>High pressure and high temperature behavior of TiAlN
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This licentiate thesis mainly reports about the behavior of arc evaporated TiAlN at high pressures and high temperatures. The extreme conditions have been obtained in metal cutting, multi anvil presses or diamond anvil cells. Several characterization techniques have been used, including x-ray diffraction and transmission electron microscopy.

Results obtained during metal cutting show that the coatings are subjected to a peak normal stress in the GPa region and temperatures around 900 °C. The samples after metal cutting are shown to have a stronger tendency towards the favorable spinodal decomposition compared to heat treatments at comparable temperatures. We have also shown an increased anisotropy of the spinodally decomposed domains which scales with Al composition and results in different microstructure evolutions. Furthermore, multi anvil press and diamond anvil cell at even higher pressures and temperatures (up to 23 GPa and 2200 °C) also show that the unwanted transformation of cubic AlN into hexagonal AlN is suppressed with an increased pressure and/or temperature.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2012. 46 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1540
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-78830 (URN)978-91-7519-863-7 (ISBN)
Presentation
2012-06-13, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 14:15
Opponent
Supervisors
Available from: 2012-06-21 Created: 2012-06-21 Last updated: 2014-09-18Bibliographically approved

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Johansson, MatsNorrby, NiklasUllbrand, JenniferOdén, Magnsu

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