|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||How to Quantify the Grain Boundary Resistance against Slip Transfer Experimentally by Combination of Geometric and Stress Approach Using Stage-I-fatigue Cracks
||Michael Marx, Florian Schaefer, Alain Franz Knorr, Christian Motz
|On-Site Speaker (Planned)
Increasing fatigue life by increasing the resistance of grain boundaries against fatigue crack growth is essential to improve lightweight constructions. So far it is not clear, what determines the resistance of a grain boundary against fatigue cracks. Actually, there are three approaches discussed; two of them, the geometric approach and the stress approach are investigated in this work. We developed an experimental technique for a systematic investigation based on focused ion beam crack initiation, in-situ imaging in the scanning electron microscope and 3D tomography which gives detailed information on the interaction of short fatigue cracks with microstructural elements. Thereby we revealed very precise insight in the geometrical parameters to describe slip and crack transfer through grain boundaries. However, there is a big discrepancy between the stress approach and the data measured by the experiments. This discrepancy could be reduced by applying the dislocation free zone model for the crack propagation.
||Planned: Publication Outside of TMS (Indicate publication title and publisher if known.)