liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Mechanical properties and thermal stability of reactive arc evaporated Ti-Cr-Al-N coatings
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 reports experimental and theoretical work on the high temperature mechanical properties and the thermal stability of cubic (c)-(Ti-Cr-Al)1-N1 coatings. It is demonstrated that it is possible to tailor and improve the properties of hard nitride coatings by different degrees of multicomponent alloying. When Cr is added to Ti-Al-N the coatings exhibit age hardening up to 1000 ºC which is higher compared to what is observed for Ti-Al-N. In addition, the coatings show a less pronounced hardness decrease when hexagonal (h)-Al-N is formed compared to Ti-Al-N. The improved thermal stability is discussed in terms of a lowered coherency stress and a lowered enthalpy of mixing due to the addition of Cr. When Ti is added to Cr-Al-N the formation and growth of the detrimental h-Al-N phase is suppressed and delayed improving the mechanical properties. This is discussed in terms of kinetic effects where the Ti atoms obstruct the Al diffusion and consequently the growth of h-Al-N precipitates. The microstructure evolution investigated at different stages of spinodal decomposition, coarsening and phase transformations are correlated to the thermal responses and the mechanical hardness of the coatings. Upon annealing up to 1400 ºC the coatings decompose into c-TiN, bcc-Cr and h-AlN. The decomposition takes place via several intermediate phases, c-CrAlN, c-TiCrN and hexagonal (β)-Cr2N.

   The oxidation resistance of (Tix-Cry-Al60)1-N1 is also investigated and presented for different x/y ratios. The results show that it is possible to generate coatings with both excellent mechanical properties and oxidation resistance improving the functionality in the working temperature range of 850-1100 ºC of for example cutting tools.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2012. , 37 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1546
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-79579Local ID: LIU-TEK-LIC-2012:31ISBN: 978-91-7519-832-3 (print)OAI: oai:DiVA.org:liu-79579DiVA: diva2:543791
Presentation
2012-09-06, Planck, Fysikhuset, Campus Valla, Linköping University, Linköping, 17:48 (English)
Opponent
Supervisors
Available from: 2012-08-22 Created: 2012-08-09 Last updated: 2014-10-07Bibliographically approved
List of papers
1. Improving thermal stability of hard coating films via a concept of multicomponent alloying
Open this publication in new window or tab >>Improving thermal stability of hard coating films via a concept of multicomponent alloying
Show others...
2011 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 99, no 9, 091903- p.Article in journal (Refereed) Published
Abstract [en]

We propose a design route for the next generation of nitride alloys via a concept of multicomponent alloying based on self-organization on the nanoscale via a formation of metastable intermediate products during the spinodal decomposition. We predict theoretically and demonstrate experimentally that quasi-ternary (TiCrAl)N alloys decompose spinodally into (TiCr)N and (CrAl)N-rich nanometer sized regions. The spinodal decomposition results in age hardening, while the presence of Cr within the AlN phase delays the formation of a detrimental wurtzite phase leading to a substantial improvement of thermal stability compared to the quasi-binary (TiAl)N or (CrAl)N alloys.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2011
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-70747 (URN)10.1063/1.3631672 (DOI)000294489300018 ()
Note

Funding Agencies|SSF||Swedish Research Council||Gran Gustafsson Foundation for Research in Natural Sciences and Medicine||

Available from: 2011-09-16 Created: 2011-09-16 Last updated: 2017-12-08
2. Decomposition and phase transformation in TiCrAlN thin coatings
Open this publication in new window or tab >>Decomposition and phase transformation in TiCrAlN thin coatings
2012 (English)In: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, ISSN 0734-2101, E-ISSN 1520-8559, Vol. 30, no 6Article in journal (Refereed) Published
Abstract [en]

Phase transformations and mechanisms that yield enhanced high temperature mechanical properties of metastable solid solutions of cubic (c)-(TixCryAlz)N coatings are discussed in this paper. Coatings grown by reactive arc evaporation technique with metal composition range y<17 at. % and 45<z<62 at. % are studied and compared with the parent TiAlN material system. The coatings exhibit age hardening up to 1000 ºC which is higher compared to what is observed for TiAlN. In addition, the coatings show a less pronounced hardness decrease when hexagonal (h)-AlN is formed compared to TiAlN. The improved thermal stability is discussed in terms of a lowered coherency stress and a lowered enthalpy of mixing due to the addition of Cr, which results in improved functionality in the working temperature range of 850-1000 ºC of for example cutting tools. Upon annealing up to 1400 ºC the coatings decompose into c-TiN, bcc-Cr and h-AlN. The decomposition takes place via several intermediate phases, c-CrAlN, c-TiCrN and hexagonal (β)-Cr2N. The microstructure  evolution investigated at different stages of spinodal decomposition and phase transformation is correlated to the thermal response and mechanical hardness of the coatings.

Place, publisher, year, edition, pages
American Vacuum Society, 2012
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-80179 (URN)10.1116/1.4757953 (DOI)
Note

On the day of the defence day the status of this article was: Manuscript

Available from: 2012-08-22 Created: 2012-08-22 Last updated: 2017-12-07Bibliographically approved
3. Improved mechanical properties in oxidation resistant AlCrN coatings through Ti addition
Open this publication in new window or tab >>Improved mechanical properties in oxidation resistant AlCrN coatings through Ti addition
(English)Manuscript (preprint) (Other (popular science, discussion, etc.))
Abstract [en]

Quaternary cubic (c)-(TixCryAl~0.60)1N1 coatings with different x to y ratios have been grown using reactive cathodic arc evaporation. Results show that by adding Ti the high temperature mechanical properties are drastically improved with a retained hardness up to 1100 ºC. The coatings show an age hardening process caused by the formation of hexagonal (h)-AlN and cubic (c)-TiCrN precipitates surrounded by a TiCrAlN host matrix. The improved properties are discussed in terms of kinetics where the addition of Ti delays and suppresses the growth the h-AlN phase. The Ti atoms also generate incoherent crystallites within the h-AlN domains disrupting the hexagonal lattice during the coarsening process. Altogether the result is that the detrimental effects that are normally associated with the hexagonal phase are shifted to higher temperatures.

The oxidation resistance is also investigated with different amount of Ti addition. The addition of Ti promotes the formation of a TiO2 oxide layer over Al2O3 resulting in a lower oxidation resistance. However, by tuning the composition it is possible to generate coatings having both high oxidation resistance and excellent high temperature mechanical properties.

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-80181 (URN)
Available from: 2012-08-22 Created: 2012-08-22 Last updated: 2013-10-02Bibliographically approved

Open Access in DiVA

Mechanical properties and thermal stability of reactive arc evaporated Ti-Cr-Al-N coatings(560 kB)831 downloads
File information
File name FULLTEXT01.pdfFile size 560 kBChecksum SHA-512
fc9dd70be3f2f6a0d3d3d2b03df019ea3c5cadd6a1f8b389b24d1df4df85540c17aa31a9eb6440b8dfce5ee3a8a3775150cd6d8d4e29cccd71ebff220a412137
Type fulltextMimetype application/pdf
omslag(47 kB)65 downloads
File information
File name COVER01.pdfFile size 47 kBChecksum SHA-512
87bd2f7c6f3c98c1b950b80a88a73485c244d6e33a1fddbe0d114f3a86d0f1b9b0b46d864b9b74e451a677316068aa4f1a5299d420889f81a2c05df4117287e1
Type coverMimetype application/pdf

Authority records BETA

Forsén, Rikard

Search in DiVA

By author/editor
Forsén, Rikard
By organisation
Nanostructured MaterialsThe Institute of Technology
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 831 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 398 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf