Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • 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
Strain evolution during spinodal decomposition of TiAlN thin films
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.
Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439 USA.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology. (Thin Film Physics)ORCID iD: 0000-0002-2837-3656
Show others and affiliations
2012 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 520, no 17, 5542-5549 p.Article in journal (Refereed) Published
Abstract [en]

We use a combination of in-situ x-ray scattering experiments during annealing and phase-field simulations to study the strain and microstructure evolution during decomposition of TiAlN thin films. The evolved microstructure is observed to depend on composition, where the larger elastic anisotropy of higher Al content films causes formation of elongated AlN and TiN domains. The simulations show strain formation in the evolving cubic-AlN and TiN domains, which is a combined effect of increasing lattice mismatch and elastic incompatibility between the domains. The experimental results show an increased compressive strain in the TiAlN phase during decomposition due to the onset of transformation to hexagonal-AlN.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 520, no 17, 5542-5549 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-75174DOI: 10.1016/j.tsf.2012.04.059ISI: 000305770200010OAI: oai:DiVA.org:liu-75174DiVA: diva2:504302
Available from: 2012-02-20 Created: 2012-02-20 Last updated: 2017-12-07Bibliographically approved
In thesis
1. High temperature behavior of arc evaporated ZrAlN and TiAlN thin films
Open this publication in new window or tab >>High temperature behavior of arc evaporated ZrAlN and TiAlN thin films
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Hard coatings can extend the life time of a tool substantially and enable higher cutting speeds which increase the productivity in the cutting application. The aim with this thesis is to extend the understanding on how the microstructure and mechanical properties are affected by high temperatures similar to what a cutting tool can reach during operation.

Thin films of ZrAlN and TiAlN have been deposited using cathodic arc-evaporation. The microstructure of as-deposited and annealed films has been studied using electron microscopy and x-ray scattering. The thermal stability has been characterized by calorimetry and thermogravity and the mechanical properties have been investigated by  nanoindentation.

The microstructure of Zr1−xAlxN thin films was studied as a function of composition, deposition conditions, and annealing temperature. The structure was found to depend on the Al content where a low (x < 0.38) Al-content results in cubic-structured ZrAlN while for x > 0.70 the structure is hexagonal. For intermediate Al contents (0.38 < x < 0.70), a  nanocomposite structure with a mixture of cubic, hexagonal and amorphous phases is obtained.

The cubic ZrAlN phase transforms by nucleation and growth of hexagonal AlN when annealed above 900 C. Annealing of hexagonal ZrAlN thin films (x > 0.70) above 900 C causes formation of AlN and ZrN rich domains within the hexagonal lattice. Annealing of nanocomposite ZrAlN thin films results in formation of cubic ZrN and hexagonal AlN. The transformation is initiated by nucleation and growth of cubic ZrN at temperatures of 1100 C while the AlN-rich domains are still amorphous or nanocrystalline. Growth of hexagonal AlN is suppressed by the high nitrogen content of the films and takes place at annealing temperatures of 1400 C.

In the more well known TiAlN system, the initial stage of decomposition is spinodal with formation of cubic structured domains enriched in TiN and AlN. By a combination of in-situ xray scattering techniques during annealing and phase field simulations, both the microstructure that evolves during decomposition and the decomposition rate are found to depend on the composition. The results further show that early formation of hexagonal AlN domains during decomposition can cause formation of strains in the cubic TiAlN phase.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2012. 78 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1428
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-75176 (URN)978-91-7519-956-6 (ISBN)
Public defence
2012-03-22, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2012-02-20 Created: 2012-02-20 Last updated: 2016-08-31Bibliographically approved
2. Phase field modeling of Spinodal decomposition in TiAlN
Open this publication in new window or tab >>Phase field modeling of Spinodal decomposition in TiAlN
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

TiAlN  thin  films  are  used  commercially  in  the  cutting  tool  industry  as  wear protection  of  the  inserts.  During  cutting,  the  inserts  are  subjected  to  high temperatures (~ 900  ° C and sometimes higher). The  objective of this work is to simulate the material behavior at such high temperatures. TiAlN has been studied experimentally at least for two decades, but no microstructure simulations have so far been performed. In this thesis two models are presented, one based on regular solution and one that takes into account clustering effects on the thermodynamic data. 

Both  models  include  anisotropic  elasticity  and  lattice  parameters  deviation from  Vegard’s  law.  The  input  parameters  used  in  the  simulations  are ab  initio calculations and experimental data.Methods for extracting diffusivities and activation energies as well as Young’s modulus  from  phase  field  results  are  presented.  Specifically,  strains,  von  Mises stresses,  energies,  and  microstructure  evolution  have  been  studied  during  the spinodal  decomposition of  TiAlN. It  has  been  found  that  strains  and  stresses  are generated during the decomposition i.e. von Mises stresses ranging between 5 and 7.5  GPa  are  typically  seen.  The  stresses  give  rise  to  a  strongly  composition dependent  elastic  energy  that  together  with  the  composition  dependent  gradient energy   determine   the   decomposed   microstructure.   Hence,   the   evolving microstructure depends strongly on the global composition. Morphologies ranging from isotropic, round domains to entangled outstretched domains can be achievedby  changing  the  Al  content.  Moreover,  the  compositional  wavelength  of  the evolved  domains  during  decomposition  is  also  composition  dependent  and  it decreases with  increasing  Al  content.  Comparing  the  compositional  wavelength evolution extracted from simulations and small angle X-ray scattering experiments show that the decomposition of TiAlN occurs in two stages; first an initial stage of constant  wavelength and  then  a  second  stage  with  an  increasing  wavelength are observed.  This  finding  is  characteristic  for  spinodal  decomposition  and  offers conclusive evidence that an ordering transformation occurs. The Young’s modulus evolution  for  Ti 0.33 Al 0.67 N  shows  an  increase  of  5%  to  ~398  GPa  during  the simulated decomposition.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2012. 72 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1545
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-79611 (URN)LIU-TEK-LIC-2012:30 (Local ID)978-91-7519-836-1 (ISBN)LIU-TEK-LIC-2012:30 (Archive number)LIU-TEK-LIC-2012:30 (OAI)
Presentation
2012-09-04, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2012-08-20 Created: 2012-08-10 Last updated: 2016-08-31Bibliographically approved

Open Access in DiVA

fulltext(679 kB)846 downloads
File information
File name FULLTEXT01.pdfFile size 679 kBChecksum SHA-512
e4fb79522fe286886074328b57fbdd4b758e241d8f583a734b307048abd817ff58ed470f5c94c773fdc962b6b395dd4be40f9c53a98d29f88be992897ed6c364
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Rogström, LinaUllbrand, JenniferHultman, LarsOdén, Magnus
By organisation
Nanostructured MaterialsThe Institute of TechnologyThin Film Physics
In the same journal
Thin Solid Films
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 846 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

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 394 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • 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