|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation Mechanisms
||Dislocation Interaction and Fatigue Damage Evolution at Grain Boundaries Studied by In-situ Cyclic Loading of Bi-crystalline Micro Samples
||Christian Motz, Jorge Rafael Velayarce
|On-Site Speaker (Planned)
The size of typical fatigue dislocation structures is in the order of micrometers. Hence, reducing the sample-size down into this regime raises questions about developing microstructures and damage. Thus, the development of fatigue microstructures and the damage evolution will be studied by in-situ fatigue tests in the SEM on single and bi- crystalline micro-samples depending on specimen size, dislocation density and crystal orientation. Not only the microstructure and damage evolution is measured, but also local stresses and strains. This allows the correlation between microstructure and damage and the local loading of the sample. In the case of grain boundaries incompatibilities in local stresses and strains are of interest as these are correlated with the damage evolution at the grain boundary. The main advantage of using micron-sized specimen is the knowledge of the local stresses and strains, which allows to associate changes in the stress vs. strain response with microstructural events.
||Planned: Supplemental Proceedings volume