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Mechanical properties of VMoNO as a function of oxygen concentration: Toward development of hard and tough refractory oxynitrides
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten. Orebro Univ, Sweden.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Teoretisk Fysik. Linköpings universitet, Tekniska fakulteten. Ruhr Univ Bochum, Germany.ORCID-id: 0000-0002-1379-6656
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten. Sandvik Coromant AB, Sweden.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0003-1785-0864
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2019 (Engelska)Ingår i: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, ISSN 0734-2101, E-ISSN 1520-8559, Vol. 37, nr 6, artikel-id 061508Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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.

Ort, förlag, år, upplaga, sidor
A V S AMER INST PHYSICS , 2019. Vol. 37, nr 6, artikel-id 061508
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Oorganisk kemi
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URN: urn:nbn:se:liu:diva-163046DOI: 10.1116/1.5125302ISI: 000504231200029OAI: oai:DiVA.org:liu-163046DiVA, id: diva2:1384246
Anmärkning

Funding Agencies|Swedish Government Strategic Research Area Grant in Materials Science on Advanced Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]; Olle Engkvist Foundation; competence center FunMat-II - Swedish Agency for Innovation Systems (Vinnova)Vinnova [2016-05156]

Tillgänglig från: 2020-01-09 Skapad: 2020-01-09 Senast uppdaterad: 2020-01-09

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Edström, DanielSangiovanni, DavideLandälv, LudvigEklund, PerGreene, Joseph EPetrov, IvanHultman, LarsChirita, Valeriu
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TunnfilmsfysikTekniska fakultetenTeoretisk Fysik
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Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films
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