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Damage-tolerant oxides by imprint of an ultra-high dislocation density

Preuß, Oliver ; Bruder, Enrico; Zhang, Jiawen; Lu, Wenjun; Rödel, Jürgen; Fang, Xufei 1
1 Karlsruher Institut für Technologie (KIT)

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 m2. 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.

Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Werkstoff- und Grenzflächenmechanik (IAM-MMI)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.2025
Sprache Englisch
Identifikator ISSN: 0955-2219
KITopen-ID: 1000175519
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Journal of the European Ceramic Society
Verlag Elsevier
Band 45
Heft 2
Seiten Art.-Nr.: 116969
Vorab online veröffentlicht am 03.10.2024
Nachgewiesen in Dimensions
Web of Science
Scopus

Verlagsausgabe §
DOI: 10.5445/IR/1000175519
Veröffentlicht am 24.10.2024
Originalveröffentlichung
DOI: 10.1016/j.jeurceramsoc.2024.116969
Scopus
Zitationen: 1
Dimensions
Zitationen: 1
Seitenaufrufe: 84
seit 24.10.2024
Downloads: 14
seit 31.10.2024
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