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Dislocation patterning and self-organization during plastic deformation areassociated with work hardening, but the exact mechanisms remain elusive. Thisis partly because studies of the structure and local strain during the initialstages of plastic deformation has been a challenge. Here we use Dark FieldX-ray Microscopy to generate 3D maps of embedded $350 \times 900 \times 72\,\mu\mathrm{m}^3$ volumes within three pure Al single crystals, all orientedfor double slip on the primary and conjugate slip systems. These were tensiledeformed by 0.6$\%$, 1.7$\%$ and 3.6$\%$, respectively. Orientation mapsrevealed the existence of two distinct types of planar dislocation boundariesboth at 0.6$\%$ and 1.7$\%$ but no systematic patterning. At 3.6$\%$, theseboundaries have evolved into a well-defined checkerboard pattern,characteristic of Geometrically Necessary Boundaries, GNBs. The GNB spacing is$\approx$ 14 $\mu$m and the misorientation $\approx$ 0.2{\deg}, in fairagreement with those at higher strains. By contrast to the sharp boundariesobserved at higher strains, the boundaries are associated with a sinusoidalorientation gradient. Maps of the elastic strain along the (111) directionexhibit fluctuations of $\pm 0.0002 $ with an average domain size of 3 $\mu$m.

3D Microstructural and Strain Evolution During the Early Stages of Tensile Deformation