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High pressure and high temperature behavior of TiAlN
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
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: urn:nbn:se:liu:diva-78830ISBN: 978-91-7519-863-7 (print)OAI: oai:DiVA.org:liu-78830DiVA: diva2:536121
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
List of papers
1. Pressure and temperature effects on the decomposition of arc evaporated Ti0.6Al0.4N coatings during metal cutting
Open this publication in new window or tab >>Pressure and temperature effects on the decomposition of arc evaporated Ti0.6Al0.4N coatings during metal cutting
2012 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 209, 203-207 p.Article in journal (Refereed) Published
Abstract [en]

The isostructural decomposition of arc evaporated Ti0.6Al0.4N coatings at the elevated temperatures and high stresses occurring during metal cutting have been studied. Comparisons are made with short time (t=10 min) anneals at temperatures typical for steel turning operations. The evolution of the decomposed domain sizes are studied by analytical transmission electron microscopy from samples originating from the rake face. Temperature and force measurements during turning allowed for separation of the effects of the temperature and stresses on domain size evolution. The results show a peak temperature of around 900 °C and a peak normal stress of around 2 GPa during cutting. The overall domain size is larger after cutting compared to the annealed sample at the same temperature. The results suggest that pressures generated during cutting promote coherent isostructural decomposition which is in line with theoretical studies but for considerably higher pressures.

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-78825 (URN)10.1016/j.surfcoat.2012.08.068 (DOI)000310656200029 ()
Note

Funding Agencies|Swedish Foundation for Strategic Research (SSF) project Designed Multicomponent Coatings, Multifilms||

Available from: 2012-06-21 Created: 2012-06-21 Last updated: 2017-12-07Bibliographically approved
2. High pressure and high temperature stabilization of cubic AlN in Ti0.60Al0.40N
Open this publication in new window or tab >>High pressure and high temperature stabilization of cubic AlN in Ti0.60Al0.40N
Show others...
2013 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 113, no 5Article in journal (Refereed) Published
Abstract [en]

In the present work, the decomposition of unstable arc evaporated Ti0.6Al0.4N at elevated temperatures and quasihydrostatic pressures has been studied both experimentally and by first-principles calculations. High pressure and high temperature (HPHT) treatment of the samples was realized using the multi anvil press and diamond anvil cell techniques. The products of the HPHT treatment of Ti0.6Al0.4N were investigated using x-ray diffractometry and transmission electron microscopy. Complimentary calculations show that both hydrostatic pressure and high temperature stabilize the cubic phase of AlN, which is one of the decomposition products of Ti0.6Al0.4N. This is in agreement with the experimental results which in addition suggest that the presence of Ti in the system serves to increase the stability region of the cubic c-AlN phase. The results are industrially important as they show that Ti0.6Al0.4N coatings on cutting inserts do not deteriorate faster under pressure due to the cubic AlN to hexagonal AlN transformation.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2013
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-90201 (URN)10.1063/1.4790800 (DOI)000314746200028 ()
Note

Funding Agencies|Swedish Foundation for Strategic Research (SSF)||German Research Foundation (DFG)|SPP 1236|

On the day of the defence day the status of this articla was Manucsript and title of this was High pressure and high temperature behavior of Ti0.60Al0.40N.

Available from: 2013-03-21 Created: 2013-03-21 Last updated: 2017-12-06
3. Microstructural anisotropy effects on the metal cutting performance of decomposed arc evaporated Ti1-xAlxN coatings
Open this publication in new window or tab >>Microstructural anisotropy effects on the metal cutting performance of decomposed arc evaporated Ti1-xAlxN coatings
Show others...
(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:nbn:se:liu:diva-78829 (URN)
Available from: 2012-06-21 Created: 2012-06-21 Last updated: 2013-10-02Bibliographically approved

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