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Phase transformations in nanocomposite ZrAlN thin films during annealing
Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
Sandvik Tooling AB, 126 80 Stockholm, Sweden.
Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439 USA.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan. (Thin Film Physics)ORCID-id: 0000-0002-2837-3656
Vise andre og tillknytning
2012 (engelsk)Inngår i: Journal of Materials Research, ISSN 0884-2914, E-ISSN 2044-5326, Vol. 27, nr 13, s. 1716-1724Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Nanocomposite Zr0.52Al0.48N1.11 thin films consisting of crystalline grains surrounded by an amorphous matrix were deposited using cathodic arc evaporation. The structure evolution after annealing of the films was studied using high-energy x-ray scattering and transmission electron microscopy. The mechanical properties were characterized by nanoindentation on as-deposited and annealed films. After annealing in temperatures of 1050-1400 C nucleation and grain growth of cubic ZrN takes place in the film. This increases the hardness, which reaches a maximum while parts of the film remain amorphous. Grain growth of the hexagonal AlN phase occurs above 1400 C.

sted, utgiver, år, opplag, sider
Cambridge University Press, 2012. Vol. 27, nr 13, s. 1716-1724
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-75171DOI: 10.1557/jmr.2012.122ISI: 000307187900007OAI: oai:DiVA.org:liu-75171DiVA, id: diva2:504295
Merknad

funding agencies|Swedish Research Council (VR)||VINNEX center of Excellence on Functional Nanoscale Materials (FunMat)||U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences|DE-AC02-06CH11357|Linnaeus Grants||

Tilgjengelig fra: 2012-02-20 Laget: 2012-02-20 Sist oppdatert: 2017-12-07bibliografisk kontrollert
Inngår i avhandling
1. High temperature behavior of arc evaporated ZrAlN and TiAlN thin films
Åpne denne publikasjonen i ny fane eller vindu >>High temperature behavior of arc evaporated ZrAlN and TiAlN thin films
2012 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Linköping: Linköping University Electronic Press, 2012. s. 78
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1428
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-75176 (URN)978-91-7519-956-6 (ISBN)
Disputas
2012-03-22, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2012-02-20 Laget: 2012-02-20 Sist oppdatert: 2019-12-10bibliografisk kontrollert

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