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Auto-organized nanostructures in the Ti-Al-N thin film system
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
2004 (English)In: SURFACES AND INTERFACES IN NANOSTRUCTURED MATERIALS AND TRENDS IN LIGA, MINIATURIZATION, AND NANOSCALE MATERIALS: Fifth MPMD Global Innovations Symposium / [ed] Mukhopadhyay, SM; Seal, S; Dahotre, N; Agarwal, A; Smugeresky, JE; Moody, N, John Wiley & Sons, 2004, 163-172 p.Conference paper (Refereed)
Abstract [en]

Age hardening by spinodal decomposition in ceramic thin film systems is reviewed. This is a new concept for advanced surface engineering with applications for wear-resistant coatings in machining processes like high-speed and dry cutting. The reactive arc deposition method with relatively low substrate temperatures is employed to produce supersaturated solid solutions of the material by ion-bombardment-induced mixing of atoms and kinetic limitation to reduce thermodynamically-driven segregation during synthesis. It is shown using electron microscopy, X-ray diffraction, and nanoindentation techniques that Ti1-xAlxN (0 less than or equal to x less than or equal to 1) coatings with compositions in the miscibility gap undergo spinodal decomposition during annealing at temperatures between similar to900 degreesC and 1100 degreesC. As a result, coherent cubic-phase nanometer-size domains form that cause an increase in hardness. These intermediate metastable domains transform into their stable phases TiN and hexagonal wurtzite-structure AlN during further thermal treatment. The findings are corroborated by Ab initio calculations of phase stability and molar volume for competing phases. Activation energies for the processes indicate defect-assisted segregation of Ti and Al. It is inferred that the success of Ti1-xAlxN coatings is not only based on its superior oxidation resistance, but also on its ability for self-adaptation to the thermal load applied during cutting by age hardening. The findings and experimental approach have implications also for other ternary and multinary ceramic systems including the group-III nitride alloys.

Place, publisher, year, edition, pages
John Wiley & Sons, 2004. 163-172 p.
Keyword [en]
transition metal nitrides; TiAlN; aging; self-assembly; nanocomposite; thin films; spinodal decomposition; hard materials; electron microscopy; nanoindentation
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-75420ISI: 000189464100017ISBN: 978-0-87339-566-3OAI: diva2:506564
5th Global Innovations Symposium held at the 2004 TMS Annual Meeting Charlotte, NC, USA March 14-18, 2004
Available from: 2012-02-29 Created: 2012-02-29 Last updated: 2012-03-07

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