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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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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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| Blanpain, Bart |
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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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Delville, R.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2020The role of Ti and TiC nanoprecipitates in radiation resistant austenitic steel: A nanoscale studycitations
- 2018Successfully estimating tensile strength by small punch testingcitations
- 2016Assessment of the U<inf>3</inf>O<inf>7</inf> Crystal Structure by X-ray and Electron Diffractioncitations
- 2016Low-Temperature Oxidation of Fine UO<inf>2</inf> Powders: A Process of Nanosized Domain Developmentcitations
- 2014Microstructural dependence on middle eigenvalue in TiNiAucitations
- 2011In-situ investigation of the fast microstructure evolution during electropulse treatment of cold drawn NiTi wirescitations
- 2011In-situ synchrotron X-Ray diffraction investigation of the fast recovery of microstructure during electropulse treatment of heavily cold drawn nanocrystalline Ni-Ti wires
- 2011In situ investigation of the fast microstructure evolutionduring electropulse treatment of cold drawn NiTi wirescitations
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article
In-situ investigation of the fast microstructure evolution during electropulse treatment of cold drawn NiTi wires
Abstract
Microstructure changes taking place during the heat treatment of cold-worked NiTi alloy are of key interest in SMA technology since they are responsible for setting the austenite shape and functional properties of the heat treated alloy. Although these microstructure changes probably occur with extremely fast kinetics, conventional heat treatments of NiTi in a furnace commonly last for several minutes or hours. Short heat treatments can be performed e.g. via Joule heating by electric current or by laser treatments. In this work, microstructure changes taking place during non-conventional fast heat treatment of thin NiTi filaments by short pulse of controlled electric power were investigated by high speed in-situ synchrotron X-ray diffraction with simultaneous evaluation of tensile force and electrical resistance of the treated wire. The results provide direct experimental evidence on the evolution of the internal strain (stress) and density of defects during the fast heating of the wire from 20°C to ~700°C. This evidence is used, together with the earlier reported results of TEM investigations of microstructures in treated wires, to identify a sequence of dynamic processes responsible for the microstructure changes during the fast heating. Based on this knowledge an interpretation of the experimentally recorded variation of the tensile stress and electric resistance during the treatment is proposed.