| People | Locations | Statistics |
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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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Bruder, Enrico
Technical University of Darmstadt
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2024Solid solution hardening in CrMnFeCoNi-based high entropy alloy systems studied by a combinatorial approach
- 2024Switching the fracture toughness of single-crystal ZnS using light irradiation
- 2024Mechanical softening of CuX alloys at elevated temperatures studied via high temperature scanning indentationcitations
- 2024{001}-textured Pb(Zr, Ti)O₃ thin films on stainless steel by pulsed laser deposition
- 2024Observation of grain boundary sliding in a lamellar ultrafine‐grained steel
- 2021Switching the fracture toughness of single-crystal ZnS using light irradiationcitations
- 2021From diluted solid solutions to high entropy alloys: Saturation grain size and mechanical properties after high pressure torsioncitations
- 2021Dislocation-toughened ceramicscitations
- 2021Nanoindentation pop‐in in oxides at room temperature: Dislocation activation or crack formation?citations
- 2021Microstructure formation and mechanical properties of ODS steels built by laser additive manufacturing of nanoparticle coated iron-chromium powderscitations
- 2019Strain-rate sensitive ductility in a low-alloy carbon steel after quenching and partitioning treatmentcitations
- 2019Towards manufacturing of Nd-Fe-B magnets by continuous rotary swaging of cast alloycitations
- 2018Anisotropic local hardening in hot-deformed Nd-Fe-B permanent magnetscitations
Places of action
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article
Nanoindentation pop‐in in oxides at room temperature: Dislocation activation or crack formation?
Abstract
<jats:title>Abstract</jats:title><jats:p>Most oxide ceramics are known to be brittle macroscopically at room temperature with little or no dislocation‐based plasticity prior to crack propagation. Here, we demonstrate the size‐dependent brittle to ductile transition in SrTiO<jats:sub>3</jats:sub> at room temperature using nanoindentation pop‐in events visible as a sudden increase in displacement at nominally constant load. We identify that the indentation pop‐in event in SrTiO<jats:sub>3</jats:sub> at room temperature, below a critical indenter tip radius, is dominated by dislocation‐mediated plasticity. When the tip radius increases to a critical size, concurrent dislocation activation and crack formation, with the latter being the dominating process, occur during the pop‐in event. Beyond the experimental examination and theoretical justification presented on SrTiO<jats:sub>3</jats:sub> as a model system, further validation on α‐Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>, BaTiO<jats:sub>3</jats:sub>, and TiO<jats:sub>2</jats:sub> are briefly presented and discussed. A new indentation size effect, mainly for brittle ceramics, is suggested by the competition between the dislocation‐based plasticity and crack formation at small scale. Our finding complements the deformation mechanism in the nano‐/microscale deformation regime involving plasticity and cracking in ceramics at room temperature to pave the road for dislocation‐based mechanics and functionalities study in these materials.</jats:p>