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Dislocation-toughened ceramics

Porz, Lukas ; Klomp, Arne Jan ; Fang, Xufei ; Li, Ning ; Yildirim, Can ; Detlefs, Carsten ; Bruder, Enrico ; Höfling, Marion ; Rheinheimer, Wolfgang ; Patterson, Eric A. ; Gao, Peng ; Durst, Karsten ; Nakamura, Atsutomo ; Albe, Karsten ; Simons, Hugh ; Rödel, Jürgen (2023)
Dislocation-toughened ceramics.
In: Materials Horizons, 2021, 8 (5)
doi: 10.26083/tuprints-00023191
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Dislocation-toughened ceramics
Language: English
Date: 2023
Place of Publication: Darmstadt
Year of primary publication: 2021
Publisher: Royal Society of Chemistry
Journal or Publication Title: Materials Horizons
Volume of the journal: 8
Issue Number: 5
DOI: 10.26083/tuprints-00023191
Corresponding Links:
Origin: Secondary publication service

Functional and structural ceramics have become irreplaceable in countless high-tech applications. However, their inherent brittleness tremendously limits the application range and, despite extensive research efforts, particularly short cracks are hard to combat. While local plasticity carried by mobile dislocations allows desirable toughness in metals, high bond strength is widely believed to hinder dislocation-based toughening of ceramics. Here, we demonstrate the possibility to induce and engineer a dislocation microstructure in ceramics that improves the crack tip toughness even though such toughening does not occur naturally after conventional processing. With modern microscopy and simulation techniques, we reveal key ingredients for successful engineering of dislocation-based toughness at ambient temperature. For many ceramics a dislocation-based plastic zone is not impossible due to some intrinsic property (e.g. bond strength) but limited by an engineerable quantity, i.e. the dislocation density. The impact of dislocation density is demonstrated in a surface near region and suggested to be transferrable to bulk ceramics. Unexpected potential in improving mechanical performance of ceramics could be realized with novel synthesis strategies.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-231919
Additional Information:

Supplementary information: https://t1p.de/jur2y

Supplementary movie 1: https://t1p.de/qb2r1

Supplementary movie 2: https://t1p.de/g8abc

Supplementary movie 3: https://t1p.de/608mn

Supplementary movie 4: https://t1p.de/s2eno

Supplementary movie 5: https://t1p.de/5r441

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Date Deposited: 28 Feb 2023 10:13
Last Modified: 25 May 2023 06:06
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/23191
PPN: 507928377
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