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Materials Testing

A key for a modern, mechanism-based materials research and development is an all‑embracing determination of the structure to correlate with the characteristics of crystalline materials. This is the focus of the scientific activities of the research group ‘Nondestructive Materials Testing and In‑Situ Deformation (Prof. Göken and Dr. Höppel) at the Institute of Advanced Materials and Processing as well as at the Institute of General Materials Properties. Nanocrystalline and ultrafine grained (UFG) materials exhibit a great potential for lightweight design. Deformation behaviour and damage mechanisms are investigated under monotone and cyclic loading conditions with particular emphasis on the effects of microstructural parameters and the enhancements of process technology for the generation of ultrafine‑grained materials.

In this context Equal Channel Angular Pressing, pulsed Electrodeposition and Accumulative Roll Bonding (ARB) are successful techniques for the fabrication of nanocrystalline materials. In particular the ARB-technique allows manufacturing of novel multi‑component materials and tailored and graded ultrafine‑grained sheet materials. For this reason intensive activities are focused on the area of nanomechanics, micro deformation behavior and in‑situ characterisation. These fields of competence of the Chair are brought to the shared activities at the ZMP to develop new materials and processes.

For the microstructural characterisation a range of different of methods are available at the ZMP, for example Atomic Force Microscopy (AFM), Raman Spectroscopy and Nanoindentation. In addition, the research group operates the Large‑Chamber Scanning Electron Microscope funded by the German Science and Research Association (DFG), which combines in an ideal way the in‑situ examination of mechanical properties with microstructural observation options. The combination of these methods allows a better understanding of deformation mechanisms and damage incidents on a microstructural basis from which to derive innovative novel materials concepts.