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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Nix Award and Lecture Symposium: Recent Advances in Nanoindentation and Small-Scale Mechanical Testing
Presentation Title Size Effects in the Plastic Deformation and Fracture of Strontium Titanate
Author(s) Karsten Durst, Javaid Farhan, Xufei Fang
On-Site Speaker (Planned) Karsten Durst
Abstract Scope Strontium titanate, SrTiO3, is one of the functional oxides which, in its single crystalline form, can undergo macroscopic plastic deformation even at room temperature, unlike other typical oxide ceramics. This makes STO an interesting model material for understanding the deformation mechanism of functional oxides, which are the basis for various advanced electronic devices. Here, size effects in plasticity and fracture are investigated using nanoindentation tests with Berkovich and spherical indenters in combination with sequential polishing, chemical etch pit techniques and high-resolution electron backscatter diffraction to quantify the geometrically necessary and total dislocation densities within the plastic zone of the indenter. Nanoindentation load-displacement curves show multiple pop-in events related to nucleation and expansion of dislocation pile-up around indentations, followed by nucleation of cracks. In the presentation, we will discuss the dislocation mechanism leading to different indentation size effects for spherical and Berkovich indentation.
Proceedings Inclusion? Planned:
Keywords Mechanical Properties, Other, Other


2021 William D Nix Award Lecture: Nanoindentation - The Next Generation
Nanoindentation as a Reliable Tool for Measuring Surface Free Energy Over Five Orders of Magnitude
Nanoindentation in an Electrochemical Cell: Electro-chemo-mechanical Coupling
NOW ON-DEMAND ONLY - Correlating the Small Scale Mechanical Behavior and the Evolving 3D-microstructure by In Situ Laue Tomography
Size Effects in the Plastic Deformation and Fracture of Strontium Titanate

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