The European Ceramic Society

News

Jan 2, 2020

In situ mechanical testing of ceramics in transmission electron microscope

YCN Research in Spot by Erkka Frankberg, Tampere University of Technology (FN) and YCN committee member

Nanostructured ceramics can change our view on ceramic mechanical properties. Lately several studies have shown plastic behavior in ceramic nanoparticles and bulk samples even at low temperatures. Traditionally based on the Griffith criterion, fracture toughness of ceramics has been improved for example by lowering the size of the internal flaws, by bridging the forming crack by fibre addition, or by tailoring a rod-like grain structure for the material inducing a crack bridging effect. Most notably, the stress induced phase transformation of ZrO2 has been successfully applied to improve fracture toughness of advanced ceramics.
One way to improve the fracture toughness of ceramics, that is not included in the Griffith criterion, is to allow plastic deformation of the ceramic structure. Already in 1987, Karch et al. suggested in Nature that by lowering the grain size of a bulk ceramic material down to few nanometers, the deformation behaviour could change from brittle to ductile even at low temperatures.
Currently, I am studying the mechanical limits of these nanostructured ceramics by using in situ transmission electron microscopy. This enables us to manipulate (compression/tension) the sample in real time while imaging the deformation mechanism. 
This will allow us to understand how these new materials behave under stress and whether we could increase the ductility of ceramics close to that of metals.

Last news

Jul 4, 2024
ACerS is offering travelling grants of 1.500 $ to attend the two 2024 ECerS Summer Schools

The grants can be allowed to undergraduate, graduate, and Ph.D. students from non-European based universities. The 2024 ECerS Summer Schools will be held prior to Electroceramics XIX (Vilnius, Lithuania - School: 17-18 August 2024)  and Shaping 9 (Warsaw, Poland - School: 24-25 September 2024)!

Jun 27, 2024
2024 ECerS International Ceramist Student Exchange Program – 3rd call!

In the frame of the 2024 ECerS International Student exchange program, ECerS is opening a third call, this time to allow grants to European Students to attend the 2024 Fall meeting of Korean Ceramic Society (COEX) that will be organised by the Korean Ceramic Society in Seoul, Korea, from 16th to 18th October 2024.

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