Mechanical properties of VMoNO as a function of oxygen concentration: Toward development of hard and tough refractory oxynitrides

Mechanical properties of VMoNO as a function of oxygen concentration : Toward development of hard and tough refractory oxynitrides

Edström, Daniel, 1986- (author): Linköpings universitet,Örebro universitet,Institutionen för naturvetenskap och teknik,Department of Physics, Chemistry, and Biology (IFM), Linköping University, Linköping, Sweden,Tunnfilmsfysik,Tekniska fakulteten,Orebro Univ, Sweden

Sangiovanni, Davide Giuseppe, 1979- (author): Linköpings universitet,Teoretisk Fysik,Tekniska fakulteten,Ruhr Univ Bochum, Germany

Landälv, Ludvig, 1982- (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten,Sandvik Coromant AB, Sweden

Eklund, Per, Docent, 1977- (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten

Greene, Joseph E, 1944- (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten,Univ Illinois, IL 61801 USA; Univ Illinois, IL 61801 USA; Natl Taiwan Univ Sci and Technol, Taiwan

Petrov, Ivan, 1949- (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten,Univ Illinois, IL 61801 USA; Univ Illinois, IL 61801 USA

Hultman, Lars, Professor, 1960- (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten

Chirita, Valeriu, 1959- (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten

(creator_code:org_t)

American Institute of Physics (AIP), 2019
2019
English.
In: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films. - : American Institute of Physics (AIP). - 0734-2101 .- 1520-8559. ; 37:6

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Abstract Subject headings

Improved toughness is a central goal in the development of wear-resistant refractory ceramic coatings. Extensive theoretical and experimental research has revealed that NaCl-structure VMoN alloys exhibit surprisingly high ductility combined with high hardness and toughness. However, during operation, protective coatings inevitably oxidize, a problem that may compromise material properties and performance. Here, the authors explore the role of oxidation in altering VMoN properties. Density functional theory and theoretical intrinsic hardness models are used to investigate the mechanical behavior of cubic V0.5Mo0.5N1-xOx solid solutions as a function of the oxygen concentration x. Elastic constant and intrinsic hardness calculations show that oxidation does not degrade the mechanical properties of V0.5Mo0.5N. Electronic structure analyses indicate that the presence of oxygen reduces the covalent bond character, which slightly lowers the alloy strength and intrinsic hardness. Nevertheless, the character of metallic d-d states, which are crucial for allowing plastic deformation and enhancing toughness, remains unaffected. Overall, the authors' results suggest that VMoNO oxynitrides, with oxygen concentrations as high as 50%, possess high intrinsic hardness, while still being ductile. Published by the AVS.

By the author/editor: Edström, Daniel, ...; Sangiovanni, Dav ...; Landälv, Ludvig, ...; Eklund, Per, Doc ...; Greene, Joseph E ...; Petrov, Ivan, 19 ...; show more...; Hultman, Lars, P ...; Chirita, Valeriu ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Inorganic Chemis ...

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