SKM 2023 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 4: Topical Session: Fundamentals of Fracture – Micromechanical Fracture Experiments
MM 4.7: Talk
Monday, March 27, 2023, 12:45–13:00, SCH A 216
Stable fracture of ceramics in the TEM — Oriol Gavalda-Diaz1,2, Shelly Conroy1, Eduardo Saiz1, and •Finn Giuliani1 — 1Department of Materials, Imperial College London, UK — 2Department of Mechanical, Manufacturing and Materials Engineering, University of Nottingham, UK
Small scale fracture tests have allowed many elements of a microstructure to be tested in isolation such as phase or grain boundaries. In our previous work we have shown that stable fracture tests in the SEM can accurately measure surface energies and the energy of individual grain boundaries. Furthermore, these tests allow the crack path and the effect of crack-defect interactions to be to be studied. However, tests in the SEM struggle to give in-depth information around the crack tip. Therefore, in this work we will demonstrate how it is possible to carry out stable fracture experiments in the TEM via a double cantilever geometry. This will be demonstrated on both silicon carbide and zirconia samples where the different mechanisms of energy dissipation will be discussed. Furthermore, a stable geometry allows additional analysis to carried out during the test, here we will discuss the possibility of using to 4D STEM to map the strain field around the crack tip.