Fang, Xufei ; Bishara, Hanna ; Ding, Kuan ; Tsybenko, Hanna ; Porz, Lukas ; Höfling, Marion ; Bruder, Enrico ; Li, Yingwei ; Dehm, Gerhard ; Durst, Karsten (2023)
Nanoindentation pop‐in in oxides at room temperature: Dislocation activation or crack formation?
In: Journal of the American Ceramic Society, 2021, 104 (9)
doi: 10.26083/tuprints-00023199
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
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 SrTiO₃ 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 SrTiO₃ 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 SrTiO₃ as a model system, further validation on α-Al₂O₃, BaTiO₃, and TiO₂ 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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Fang, Xufei ; Bishara, Hanna ; Ding, Kuan ; Tsybenko, Hanna ; Porz, Lukas ; Höfling, Marion ; Bruder, Enrico ; Li, Yingwei ; Dehm, Gerhard ; Durst, Karsten |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Nanoindentation pop‐in in oxides at room temperature: Dislocation activation or crack formation? |
| Sprache: | Englisch |
| Publikationsjahr: | 2023 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2021 |
| Verlag: | Wiley |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the American Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 104 |
| (Heft-)Nummer: | 9 |
| DOI: | 10.26083/tuprints-00023199 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/23199 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichungsservice |
| Kurzbeschreibung (Abstract): | 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 SrTiO₃ 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 SrTiO₃ 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 SrTiO₃ as a model system, further validation on α-Al₂O₃, BaTiO₃, and TiO₂ 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. |
| Freie Schlagworte: | crack formation, dislocation, nanoindentation pop-in, oxide, size effect |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-231998 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe |
| Hinterlegungsdatum: | 10 Feb 2023 09:20 |
| Letzte Änderung: | 13 Feb 2023 07:06 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Nanoindentation pop‐in in oxides at room temperature: Dislocation activation or crack formation? (deposited 10 Feb 2023 09:20) [Gegenwärtig angezeigt]
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