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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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Mummery, Pm
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2023Delayed surface degradation in W-Ta alloys at 400°C under high-fluence 40 eV He plasma exposurecitations
- 2021High-dose ion irradiation damage in Fe28Ni28Mn26Cr18 characterised by TEM and depth-sensing nanoindentationcitations
- 2019Analysis of dynamic fracture and fragmentation of graphite bricks by combined XFEM and cohesive zone approachcitations
- 2019Configurational Entropy in Multicomponent Alloys: Matrix Formulation from Ab Initio Based Hamiltonian and Application to the FCC Cr-Fe-Mn-Ni Systemcitations
- 20173D dynamic fracture and fragmentation of AGR Graphite brick slices using XCZM
- 2017Short-Range Order in High Entropy Alloyscitations
- 2017Dynamic fracture analysis by explicit solid dynamics and implicit crack propagationcitations
- 2017Crack healing behaviour of Cr2AlC MAX phase studied by X-ray tomographycitations
- 2017The effects of ion irradiation on the micromechanical fracture strength and hardness of a self-passivating tungsten alloycitations
- 2017Micro X-ray Computed Tomography Image-based Two-scale Homogenisation of Ultra High Performance Fibre Reinforced Concretecitations
- 2016Fracture strength testing of a self-passivating tungsten alloy at the micrometre scalecitations
- 2016Investigating the effects of stress on the pore structures of nuclear grade graphitescitations
- 2016In situ observation of mechanical damage within a SiC-SiC ceramic matrix compositecitations
- 2013Observation and quantification of three-dimensional crack propagation in poly-granular graphitecitations
- 2012Gel-cast glass-ceramic tissue scaffolds of controlled architecture produced via stereolithography of mouldscitations
- 2009A finite element approach to the biomechanics of dromaeosaurid dinosaur claws
- 2008Investigating predictive capabilities of image-based modeling for woven composites in a scalable computing environment
- 2008Analysis of crack propagation in nuclear graphite using three-point bending of sandwiched specimenscitations
- 2008Nanoindentation of histological specimens using an extension of the Oliver and Pharr methodcitations
- 2005Full-field strain mapping by optical correlation of micrographs acquired during deformationcitations
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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>