Porz, Lukas ; Scherer, Michael ; Höfling, Marion ; Nakamura, Atsutomo ; Rheinheimer, Wolfgang ; Rödel, Jürgen (2023)
Dislocation-based high-temperature plasticity of polycrystalline perovskite SrTiO3.
In: Journal of Materials Science, 58
doi: 10.1007/s10853-022-07405-3
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Dislocation networks have been demonstrated to substantially enhance functional properties. As-sintered samples are virtually devoid of dislocations, new innovative techniques for introducing sufficiently high dislocation densities into polycrystalline ceramics are needed. While dislocation-based plasticity at high temperatures has been demonstrated for a large range of ceramic single crystals, plasticity in polycrystals is much less understood. Here, we demonstrate plastic strains in excess of several % based on dislocation motion in polycrystalline SrTiO3 at & 1100 °C with 3.9 lm grain size. Ultra-high voltage electron microscopy reveals an associated increase in dislocation density by three orders of magnitude. Achievable strain rates are comparable to creep-based mechanisms and much less sensitive to applied stress than observed for metals. A specialized testing protocol allows quantification of the deformability via stress exponent, activation volume and activation enthalpy giving additional quantification. In conjunction with TEM images, the mechanical data gives insight into the underlying mechanisms.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Porz, Lukas ; Scherer, Michael ; Höfling, Marion ; Nakamura, Atsutomo ; Rheinheimer, Wolfgang ; Rödel, Jürgen |
| Art des Eintrags: | Bibliographie |
| Titel: | Dislocation-based high-temperature plasticity of polycrystalline perovskite SrTiO3 |
| Sprache: | Englisch |
| Publikationsjahr: | 10 Januar 2023 |
| Verlag: | Springer |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Materials Science |
| Jahrgang/Volume einer Zeitschrift: | 58 |
| DOI: | 10.1007/s10853-022-07405-3 |
| Kurzbeschreibung (Abstract): | Dislocation networks have been demonstrated to substantially enhance functional properties. As-sintered samples are virtually devoid of dislocations, new innovative techniques for introducing sufficiently high dislocation densities into polycrystalline ceramics are needed. While dislocation-based plasticity at high temperatures has been demonstrated for a large range of ceramic single crystals, plasticity in polycrystals is much less understood. Here, we demonstrate plastic strains in excess of several % based on dislocation motion in polycrystalline SrTiO3 at & 1100 °C with 3.9 lm grain size. Ultra-high voltage electron microscopy reveals an associated increase in dislocation density by three orders of magnitude. Achievable strain rates are comparable to creep-based mechanisms and much less sensitive to applied stress than observed for metals. A specialized testing protocol allows quantification of the deformability via stress exponent, activation volume and activation enthalpy giving additional quantification. In conjunction with TEM images, the mechanical data gives insight into the underlying mechanisms. |
| 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: | 13 Feb 2023 07:14 |
| Letzte Änderung: | 13 Feb 2023 12:33 |
| PPN: | 504952153 |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum