To access the full text documents, please follow this link: http://hdl.handle.net/2117/26073

Title:	Structure, deformation and fracture of arc evaporated Zr-Si-N hard films
Author:	Yalamanchili, K; Forsen, R; Jiménez Piqué, Emilio; Johansson Joesaar, M.P; Roa Rovira, Joan Josep; Ghafoor, N; Oden, M
Other authors:	Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Micromecànica i Fiabilitat dels Materials
Abstract:	Zr-Si-N films with varying Si contents were grown on WC-Co substrates by reactive cathodic arc deposition technique. The resulting microstructures of the films correlate to dominant variation in mechanical properties and deformation mechanisms. Si forms a substitutional solid solution in the cubic ZrN lattice up to 1.8 at.% exhibiting a fine columnar microstructure. Further Si additions result in precipitation of an amorphous (a)-SiNx phase and evolution of a nanocomposite microstructure (nc ZrN/a-SiNx) which completely suppresses the columnar microstructure at 63 at.% Si. The rotation-induced artificial layering during film growth is used as a marker to visualize the deformation of the film. A dislocation-based homogeneous plastic deformation mechanism dominates the columnar microstructure, while grain boundary sliding is the active mechanism mediating heterogeneous plastic deformation in the nanocomposite microstructure. Film hardness increases with increasing Si content in the columnar microstructure due to an effective solid solution strengthening. The deformation mechanism of localized grain boundary sliding in the nanocomposite microstructure results in a lower hardness. When cracking is induced by indentation, the fine columnar microstructure exhibits pronounced crack deflection that results in a higher fracture resistance compared to the nanocomposite films. (C) 2014 Elsevier B.V. All rights reserved.
Abstract:	Peer Reviewed
Subject(s):	-Àrees temàtiques de la UPC::Enginyeria dels materials -Material -Nanotechnology -Zr-Si-N -Nanostructured film -Transmission electron microscopy -Nanoindentation -Deformation mechanisms -Fracture toughness -TRANSMISSION ELECTRON-MICROSCOPY -MECHANICAL-PROPERTIES -THERMAL-STABILITY -THIN-FILMS -COATINGS -NANOINDENTATION -SUPERHARD -MICROSTRUCTURE -INDENTATION -Materials -- Propietats mecàniques -Nanotecnologia
Rights:	Attribution-NonCommercial-NoDerivs 3.0 Spain http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Document type:	Article - Published version Article
Share:

Show full item record