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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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Mcdonald, Samuel Alan
MAX IV Laboratory
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2018AN INVESTIGATION INTO THE INTERFACE BEHAVIOUR OF AN ALUMINIUM/SILICON CARBIDE FIBRE METAL MATRIX COMPOSITE
- 2017Crack healing behaviour of Cr2AlC MAX phase studied by X-ray tomographycitations
- 2017Strain-induced Reactivation of Corrosion Pits in Austenitic Stainless Steelcitations
- 2017Microstructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography (LabDCT)citations
- 2016Application of a Quasi in-situ Experimental Approach to Estimate 3-D Pitting Corrosion Kinetics in Stainless Steelcitations
- 2014Correlative tomographycitations
- 2013Observation and quantification of three-dimensional crack propagation in poly-granular graphitecitations
- 2012In-situ X-ray microtomography study of the movement of a granular material within a diecitations
- 2012Spallation response of Ti-6Al-4V: Rear surface velocimetry and X-ray tomographycitations
- 2011In situ 3D X-ray microtomography study comparing auxetic and non-auxetic polymeric foams under tensioncitations
- 2009Shear cracking in an Al powder compact studied by X-ray microtomographycitations
- 2007The shock response, simulation and microstructural determination of a model composite materialcitations
- 2006Particle movement during the deep penetration of a granular material studied by X-ray microtomographycitations
- 2004Quantification of creep cavitation damage around a crack in a stainless steel pressure vesselcitations
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article
Crack healing behaviour of Cr2AlC MAX phase studied by X-ray tomography
Abstract
<p>The autonomous crack-healing capability of Cr<sub>2</sub>AlC MAX phase ceramic by surface oxidation at elevated temperatures has a huge potential for high temperature structural and protective coating applications. In this work we use time-lapse X-ray computed tomography (CT) to track the fine details of local crack filling phenomena in 3 dimensions (3D) with time. The maximum crack width that could be fully healed upon exposure to 1200 °C in air is 4.8 μm in 4 h and 10 μm after 12 h. Furthermore, during healing Cr<sub>7</sub>C<sub>3</sub> phase is observed beneath the dense Al<sub>2</sub>O<sub>3</sub> layer (average thickness of 1 μm on each crack surface) when the crack width exceeds 2 μm. The 3D image sequences indicated that the rate of healing is essentially independent of position along, or across, the crack faces. The crack healing kinetics of Cr<sub>2</sub>AlC at 1200 °C broadly follows a parabolic rate law with a rate constant of 4.6 × 10<sup>−4</sup> μm<sup>2</sup> s<sup>−1</sup>The microstructure, composition and thickness of the oxide scale in the healed crack area are characterized via post mortem SEM-EDS measurements and confirm the formation of an initial dense alumina layer on top of which a more porous layer forms. Impurity Cr particles appear to accelerate the oxidation process locally and correlative SEM imaging of the same region suggests this is by providing Cr<sub>2</sub>O<sub>3</sub> nucleation sites.</p>