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| Naji, M. |
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| Motta, Antonella |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Forsén, Rikard
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Topics
Publications (9/9 displayed)
- 2014High temperature phase decomposition in TixZryAlzNcitations
- 2014High temperature phase decomposition in TixZryAlzNcitations
- 2014Nanostructuring and coherency strain in multicomponent hard coatingscitations
- 2014Multicomponent Alloying for Improved Hard Coatingscitations
- 2013Effects of Ti alloying of AlCrN coatings on thermal stability and oxidation resistancecitations
- 2013Coherency strain engineered decomposition of unstable multilayer alloys for improved thermal stabilitycitations
- 2012Decomposition and phase transformation in TiCrAlN thin coatingscitations
- 2012Mechanical properties and thermal stability of reactive arc evaporated Ti-Cr-Al-N coatings
- 2011Improving thermal stability of hard coating films via a concept of multicomponent alloyingcitations
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article
Coherency strain engineered decomposition of unstable multilayer alloys for improved thermal stability
Abstract
A concept to improve hardness and thermal stability of unstable multilayer alloys is presented based on control of the coherency strain such that the driving force for decomposition is favorably altered. Cathodic arc evaporated cubic TiCrAlN/Ti 1−x Cr x N multilayer coatings are used as demonstrators. Upon annealing, the coatings undergo spinodal decomposition into nanometer-sized coherent Ti- and Al-rich cubic domains which is affected by the coherency strain. In addition, the growth of the domains is restricted by the surrounding TiCrN layer compared to a non-layered TiCrAlN coating which together results in an improved thermal stability of the cubic structure. A significant hardness increase is seen during decomposition for the case with high coherency strain while a low coherency strain results in a hardness decrease for high annealing temperatures. The metal diffusion paths during the domain coarsening are affected by strain which in turn is controlled by the Cr-content (x) in the Ti 1−x Cr x N layers. For x = 0 the diffusion occurs both parallel and perpendicular to the growth direction but for x > =0.9 the diffusion occurs predominantly parallel to the growth direction. Altogether this study shows a structural tool to alter and fine-tune high temperature properties of multicomponent materials.