Preuß, Oliver ; Bruder, Enrico ; Zhang, Jiawen ; Lu, Wenjun ; Rödel, Jürgen ; Fang, Xufei (2025)
Damage-tolerant oxides by imprint of an ultra-high dislocation density.
In: Journal of the European Ceramic Society, 45 (2)
doi: 10.1016/j.jeurceramsoc.2024.116969
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Dislocations in ductile ceramics offer the potential for robust mechanical performance while unlocking versatile functional properties. Previous studies have been limited by small volumes with dislocations and/or low dislocation densities in ceramics. Here, we use Brinell ball scratching to create crack-free, large plastic zones, offering a simple and effective method for dislocation engineering at room temperature. Using MgO, we tailor high dislocation densities up to ~1015 m 2. We characterise the plastic zones by chemical etching, electron channelling contrast imaging, and scanning transmission electron microscopy, and further demonstrate that crack initiation and propagation in the plastic zones with high-density dislocations can be completely suppressed. The residual stresses in the plastic zones were analysed using high-resolution electron backscatter diffraction. With the residual stress being subsequently relieved via thermal annealing while retaining the high-density dislocations, we observe the cracks are no longer completely suppressed, but the pure toughening effect of the dislocations remains evident.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2025 |
| Autor(en): | Preuß, Oliver ; Bruder, Enrico ; Zhang, Jiawen ; Lu, Wenjun ; Rödel, Jürgen ; Fang, Xufei |
| Art des Eintrags: | Bibliographie |
| Titel: | Damage-tolerant oxides by imprint of an ultra-high dislocation density |
| Sprache: | Englisch |
| Publikationsjahr: | Februar 2025 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 45 |
| (Heft-)Nummer: | 2 |
| DOI: | 10.1016/j.jeurceramsoc.2024.116969 |
| Kurzbeschreibung (Abstract): | Dislocations in ductile ceramics offer the potential for robust mechanical performance while unlocking versatile functional properties. Previous studies have been limited by small volumes with dislocations and/or low dislocation densities in ceramics. Here, we use Brinell ball scratching to create crack-free, large plastic zones, offering a simple and effective method for dislocation engineering at room temperature. Using MgO, we tailor high dislocation densities up to ~1015 m 2. We characterise the plastic zones by chemical etching, electron channelling contrast imaging, and scanning transmission electron microscopy, and further demonstrate that crack initiation and propagation in the plastic zones with high-density dislocations can be completely suppressed. The residual stresses in the plastic zones were analysed using high-resolution electron backscatter diffraction. With the residual stress being subsequently relieved via thermal annealing while retaining the high-density dislocations, we observe the cracks are no longer completely suppressed, but the pure toughening effect of the dislocations remains evident. |
| Freie Schlagworte: | dislocation, MgO, damage tolerance, fracture, room-temperature plasticity |
| ID-Nummer: | Artikel-ID: 116969 |
| 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 Okt 2024 07:26 |
| Letzte Änderung: | 10 Okt 2024 12:13 |
| PPN: | 522089240 |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum