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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 8: Microscopy and Tomography with X-ray Photons, Electrons, Ions and Positrons
KFM 8.3: Talk
Monday, March 18, 2024, 12:50–13:10, TC 010
Lattice strain distribution within BCC polycrystals - How does the local grain neighbourhood influence strain localization — •Konrad Prikoszovich1, Jonathan Wright2, Wolfgang Ludwig2,3, Patric Gruber1, and Christoph Kirchlechner1 — 1Institute for Applied Materials IAM, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 2ESRF- European Synchrotron Radiation Facility, Grenoble, France — 3MATEIS, INSA Lyon, Villeurbanne, France
Strain and stress heterogeneities determine the lifetime and failure of structural materials. The relationship between macroscopic and microscopic stresses is central for a quantitative understanding of the mechanical behaviour of polycrystalline materials. We performed Diffraction Contrast Tomography (DCT) measurements at ID11, ESRF, to determine the shape, arrangement, orientation and average elastic strain tensor of a representative ensemble of grains during mechanical loading. Here, we want to present our results from the latest beam time, where we managed to investigate up to 10000 grains during tensile deformation. Different annealing protocols have been utilized prior to the experiments to vary the eigenstrains of our samples in order to investigate how those eigenstrains affect the strain localization during loading. By analysing the different local microstructural aspects present in this unique dataset, we hope to identify parameters, which promote strain localization. This information can then be used to design microstructures with improved resilience against strain localization, leading to a higher lifetime of structural materials.
Keywords: X-ray Tomography; Synchrotron; X-ray Diffraction; Strain localizatiob