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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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Roberts, S. G.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2019Helical dislocations: Observation of vacancy defect bias of screw dislocations in neutron irradiated Fe–9Crcitations
- 2016Effect of the milling atmosphere on the microstructure and mechanical properties of a ODS Fe-14Cr model alloycitations
- 2015Mechanical and microstructural investigations of tungsten and doped tungsten materials produced via powder injection moldingcitations
- 2013Recent progress in research on tungsten materials for nuclear fusion applications in Europecitations
- 2013Recent progress in research on tungsten materials for nuclear fusion applications in Europecitations
- 2008Residual stress distributions around indentations and scratches in polycrystalline Al2O3 and Al2O3/SiC nanocomposites measured using fluorescence probescitations
- 2002Modelling the initiation of cleavage fracture of ferritic steelscitations
- 2001Residual stress and subsurface damage in machined alumina and alumina/silicon carbide nanocomposite ceramicscitations
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article
Residual stress distributions around indentations and scratches in polycrystalline Al2O3 and Al2O3/SiC nanocomposites measured using fluorescence probes
Abstract
We report a study of the residual stress state around indentations and single-point scratches in polycrystalline alumina and alumina/SiC nanocomposites using Cr3+ fluorescence piezospectroscopy. The alumina specimens displayed residual stress levels up to 550 MPa, whereas the nanocomposite specimens had maximum stress levels close to 2 GPa. These stress levels are consistent with those obtained using other experimental techniques. The spatial variation of this stress is shown to be consistent with simple elastic/plastic models of indentation. The broadening of the peaks in the fluorescence spectra is used to estimate the density of dislocations in the plastically deformed region below indentations and scratches. Our results indicate a greater depth of deformation around indents and scratches in the nanocomposites when compared with the alumina surfaces. The inferred dislocation densities and the depth of the deformed region beneath the alumina and nanocomposite surfaces are shown to be consistent with those of ground surfaces reported in earlier studies. © 2007 Acta Materialia Inc.