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Multimodal 3D X-ray topotomography dataset of slip activity and transmission in Ti-7Al

Echlin, McLean1; Stinville, Jean-Charles2; Ludwig, Wolfgang34; Callahan, Patrick5; Pollock, Tresa1; Proudhon, Henry6

Published Jul 02, 2026 on Dryad. https://doi.org/10.5061/dryad.sj3tx96g8

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Abstract

Plastic deformation in polycrystalline metals is usually primarily accommodated through dislocation glide, which often organizes into discrete slip bands. The evolution of plasticity is governed by the interactions of these dislocation structures with one another, as well as with grain boundaries and other microstructural interfaces or features. Traditional observations of slip bands are largely limited to free surfaces, constraining our understanding of their three-dimensional behavior within the bulk. The X-ray topotomography and diffraction contrast tomography (DCT) datasets presented here enable direct visualization of the three-dimensional morphology of slip bands in relation to the surrounding grain structure. These data reveal, for instance, in the investigated titanium alloy that slip transmission across grain boundaries is more prevalent at free surfaces, while in the bulk, transmission events are often driven by geometrically constrained regions, such as triple junctions, where elevated local stress heterogeneity promotes dislocation activity across interfaces. This dataset is shared with the community to facilitate broader access to and analysis of correlated 3D deformation and microstructure alloy datasets, which are expected to become increasingly prevalent in the near future.