About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Internal Stress Evolution During Cyclic Deformation of Aluminum Observed by High-resolution Reciprocal Space Mapping |
Author(s) |
Thomas Kohne, Zoltan Hegedues, Matteo Villa, Jun-Sang Park, Ulrich Lienert, Wolfgang Pantleon |
On-Site Speaker (Planned) |
Thomas Kohne |
Abstract Scope |
Aluminum AA1050 is cyclically deformed in symmetric tension and compression while monitoring the microstructure by high-resolution reciprocal space mapping, a high-energy X-ray diffraction technique. During cyclic deformation ordered dislocation structures form consisting of hard dislocation walls with high dislocation density and dislocation-free soft subgrains. The developing composite structure causes internal stresses as described by the composite model in its refined version. Such internal stresses result in an asymmetric peak broadening where a monotonous relation between both is commonly presumed. Monitoring multiple grains in situ during several tension and compression cycles shows that the maxima of peak asymmetry (and hence of the internal stresses) do not coincide with the maxima of the applied macroscopic stress, but occur closer to the onset of reverse yielding of the subgrains. These findings shed new light on the evolution of internal stresses during cyclic deformation and its consequences will be discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Aluminum, Mechanical Properties |