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Growth and Mechanical Behavior of Nanoscale Structures in ZrN/Zr0.63Al0.37N Multilayers
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
Functional Materials, Materials Science and Engineering Department (MSE), Saarland University, Saarbrücken, Germany.
Departament de Ciència del Materials i Enginyeria Metal·lúrgica, Universitat Politècnica de Catalunya, Barcelona, Spain.
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Structure and mechanical properties of monolithic and nanoscale multilayers of ZrN/Zr0.63Al0.37N are investigated as a function of Zr0.63Al0.37N layer thickness. ZrN/Zr0.63Al0.37N multilayers were deposited by reactive magnetron sputtering on MgO (001) substrates at a temperature of 700 °C. Monolithic Zr0.63Al0.37N film shows a chemically segregated nanostructure of cubic-ZrN and wurtzite-AlN rich domains with incoherent interfaces. Three dimensional atom probe measurements reveal comparable chemical segregation between monolithic and multilayer Zr0.63Al0.37N film. The multilayers show systematic changes in nanostructure as a function of Zr0.63Al0.37N layer thickness resulting in mechanical properties such as hardness and fracture resistance being tunable. A maximum hardness of 34 GPa is achieved with 10 nm Zr0.63Al0.37N layer thickness having semi-coherent interfaces between wurtzite-AlN and cubic-ZrN rich domains. Higher fracture resistance is achieved at 2nm Zr0.63Al0.37N where AlN rich domains are epitaxially stabilized in the metastable cubic phase.

National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-106762OAI: oai:DiVA.org:liu-106762DiVA: diva2:718622
Available from: 2014-05-21 Created: 2014-05-21 Last updated: 2014-05-21Bibliographically approved
In thesis
1. ZrN based Nanostructured Hard Coatings: Structure-Property Relationship
Open this publication in new window or tab >>ZrN based Nanostructured Hard Coatings: Structure-Property Relationship
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Ever since the hard coatings have been introduced, there has been a constant push for better mechanical properties, which motivates for deeper understanding of the microstructure-mechanical properties correlation. The aim of this thesis is to extend the knowledge on how microstructural variation influences the deformation, fracture and wear behavior of ZrN based nanostructured coatings.

Few microns thick, monolithic Zr-Si-N and multilayered Zr-Al-N coatings were deposited by reactive arc deposition and unbalanced reactive magnetron sputtering techniques respectively. The microstructures of the coatings were studied using xray diffraction, transmission electron microscopy and scanning electron microscopy. Indentation induced plastic deformation and fracture behavior was visualized by extracting the lamellae under the indent using focused ion beam milling technique combined with transmission electron microscopy. Wear behavior of the coatings were characterized by reciprocating sliding wear test following microscopic observations of the wear track.

Monolithic Zr-Si-N coating shows a systematic variation of microstructure, hardness and fracture resistance as a function of Si content. Si forms a substitutional solid solution in the cubic ZrN lattice up to 1.8 at. % exhibiting a fine columnar structure. Further Si additions result in precipitation of an amorphous SiNX phase in the form of a nanocomposite structure (nc ZrN- a SiNX) that is fully developed at 6.3 at. % Si. Dislocation based homogeneous deformation is the dominating plastic deformation mode in the columnar structure, while grain boundary sliding mediated plastic deformation causing localized heterogeneous shear bands dominates in the nanocomposite structure.

Indentation induced cracking shows the higher fracture resistance for columnar structure compared to the nanocomposite coatings. Crack branching and deflection were observed to be the key toughening mechanisms operating in the columnar structured coating. Reciprocating wear tests on these coatings show a bi-layer wear mode dominated by tribo-oxidation. Nanocomposite coatings offer superior resistance to both static and tribo-oxidation, resulting in higher wear resistance even though they are soft and brittle.

Monolithic and multilayers of Zr0.63Al0.37N coatings were grown at a deposition temperature of 700 °C. Monolithic Zr0.63Al0.37N coating shows a chemically segregated nanostructure consisting of wurtzite-AlN and cubic-ZrN rich domains with incoherent interfaces. When the same composition is sandwiched between ZrN nanolaminates, Zr0.63Al0.37N shows a layer thickness dependent structure, which results in systematic variation of hardness and fracture resistance of the coatings. Maximum hardness is achieved when the Zr0.63Al0.37N layer shows semicoherent wurtzite-AlN rich domains. While the maximum toughness is achieved when AlN- rich domains are pseudomorphically stabilized into cubic phase. Stress induced transformation of metastable cubic-AlN to thermodynamically stable wurtzite-AlN was suggested to be the likely toughening mechanism.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2014. 65 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1664
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-106763 (URN)10.3384/lic.diva-106763 (DOI)978-91-7519-309-0 (ISBN)
Presentation
2014-06-04, Visionen, B-huset, ingång 27, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2014-05-21 Created: 2014-05-21 Last updated: 2014-05-22Bibliographically approved

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Yalamanchili, KumarRogström, LinaGhafoor, NaureenOdén, Magnus

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