Abstract
Dispersion strengthened aluminium was investigated in the as-produced, annealed and deformed states by convergent beam electron diffraction. The positions of the higher-order Laue zone (HOLZ) lines were determined by applying a Hough transform. Kinematic simulations were used for comparison with the experimental images, where the HOLZ line positions were individually corrected to account for the dynamic line shifts. Lattice parameters were derived by an iterative algorithm based on that of Rozeveld and Howe. It is demonstrated that the solutions are not unique, but instead belong to a manifold of equivalent lattice parameter sets of dimension two or higher. On a semi-quantitative basis, the results show long-range strain fields to be present inside the aluminium grains, explaining the peculiar mechanical behaviour of the material. The correlation between the strain fields and the observed dislocation networks is discussed.
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