Dresden 2026 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 7: Mechanical Properties and Alloy Design II

MM 7.10: Vortrag

Montag, 9. März 2026, 18:15–18:30, SCH/A215

Insights into loading condition and microstructural evolution under tribological load — •Antje Dollmann, Robin Freville, Patric Gruber, Christoph Kirchlechner, and Christian Greiner — IAM, KIT, Karlsruhe, Germany

Tribological loading changes the microstructure of materials in contact, e.g. in coarse-grained metals, grain refinement occurs, followed by cracks formation and wear particles removal leading to component failure. This requires an adequate description of the stress field to understand the ongoing microstructural evolution. Due to the complexity of tribological loading, two approaches were explored, both on single-crystalline face-centred cubic metallic materials:

(1) The experiments on CoCrFeMnNi were designed in such a fashion that in some crystal orientations deformation twins were formed. These served as probes to validate various stress field models. General trends regarding the influence of different materials parameters can be identified. The most significant mismatch is between the experimentally observed deformation layer depth and the calculated depth by the stress field. (2) In copper, one deformation layer was analysed by *Laue. Based on its higher sensibility towards small deformations, the deformation layer thickness was greater than what had been detected previously. The combination of those approaches gives deep insight into the so far hidden stress field, which will support future efforts in designing materials to withstand tribological loading.

Keywords: Tribology; microstructure; µLaue