Okafor, Chukwudalu ; Ding, Kuan ; Preuß, Oliver ; Khansur, Neamul ; Rheinheimer, Wolfgang ; Fang, Xufei (2024)
Near‐surface plastic deformation in polycrystalline SrTiO₃ via room‐temperature cyclic Brinell indentation.
In: Journal of the American Ceramic Society, 2024, 107 (10)
doi: 10.26083/tuprints-00028274
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
Dislocations are being used to tune versatile mechanical and functional properties in oxides with most current studies focusing on single crystals. For potentially wider applications, polycrystalline ceramics are of concern, provided that dislocations can be successfully introduced. However, in addition to preexisting pores and flaws, a major barrier for bulk plastic deformation of polycrystalline ceramics lies in the grain boundaries (GBs), which can lead to dislocation pile‐up and cracking at the GBs due to the lack of sufficient independent slip systems in ceramics at room temperature. Here, we use the cyclic Brinell indentation method to circumvent the bulk deformation and focus on near‐surface regions to investigate the plastic deformation of polycrystalline SrTiO₃ at room temperature. Dislocation etch‐pit analysis suggests that plastic deformation can be initiated within the grains, at the GBs, and from the GB triple junction pores. The deformability of the individual grains is found to be dependent on the number of cycles, as also independently evidenced on single‐crystal SrTiO₃ with representative surface orientations (001), (011), and (111). We also identify a grain‐size‐dependent plastic deformation.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Okafor, Chukwudalu ; Ding, Kuan ; Preuß, Oliver ; Khansur, Neamul ; Rheinheimer, Wolfgang ; Fang, Xufei |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Near‐surface plastic deformation in polycrystalline SrTiO₃ via room‐temperature cyclic Brinell indentation |
| Sprache: | Englisch |
| Publikationsjahr: | 19 November 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | Oktober 2024 |
| Ort der Erstveröffentlichung: | Oxford |
| Verlag: | Wiley-Blackwell |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the American Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 107 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.26083/tuprints-00028274 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/28274 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | Dislocations are being used to tune versatile mechanical and functional properties in oxides with most current studies focusing on single crystals. For potentially wider applications, polycrystalline ceramics are of concern, provided that dislocations can be successfully introduced. However, in addition to preexisting pores and flaws, a major barrier for bulk plastic deformation of polycrystalline ceramics lies in the grain boundaries (GBs), which can lead to dislocation pile‐up and cracking at the GBs due to the lack of sufficient independent slip systems in ceramics at room temperature. Here, we use the cyclic Brinell indentation method to circumvent the bulk deformation and focus on near‐surface regions to investigate the plastic deformation of polycrystalline SrTiO₃ at room temperature. Dislocation etch‐pit analysis suggests that plastic deformation can be initiated within the grains, at the GBs, and from the GB triple junction pores. The deformability of the individual grains is found to be dependent on the number of cycles, as also independently evidenced on single‐crystal SrTiO₃ with representative surface orientations (001), (011), and (111). We also identify a grain‐size‐dependent plastic deformation. |
| Freie Schlagworte: | cyclic indentation, dislocation, plasticity, strontium titanate, surface deformation |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-282747 |
| Zusätzliche Informationen: | This article also appears in: Editor’s Choice JACerS 2024 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 540 Chemie 600 Technik, Medizin, angewandte Wissenschaften > 660 Technische 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: | 19 Nov 2024 12:30 |
| Letzte Änderung: | 20 Nov 2024 11:01 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Near‐surface plastic deformation in polycrystalline SrTiO₃ via room‐temperature cyclic Brinell indentation. (deposited 19 Nov 2024 12:30) [Gegenwärtig angezeigt]
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