Small scale and in-situ testing techniques, like nanoindentation, are becoming extremely important in order to observe and reliably characterize the mechanical behavior of materials on a local scale. For nanostructured materials, this deformation behavior is mainly dominated by dislocation interaction processes at the multitude of grain boundaries.

In this project, the deformation behavior of different ultrafine-grained materials is studied by using static and dynamic nanoindentation experiments. The results will be compared to in-situ TEM nanoindentation experiments in order to unveil the dislocation motions in these highly deformed materials. Thereby, a direct observation of dislocation-grain boundary interactions can be achieved. Finally, the results will be discussed in comparison with coarse grained and single crystalline materials.


Acknowledgement: This work is supported by the Zukunftsfonds Steiermark (PN 6019: Nanofatigue - Erm√ľdungseigenschaften nanostrukturierter Werkstoffe) and is performed in collaboration with the HTL Leoben.