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- W2615177316 abstract "With high angular resolution three-dimensional X-ray diffraction quantitative information is gained about dislocation structures in individual grains in the bulk of a macroscopic specimen by acquiring reciprocal space maps. In high resolution three-dimensional reciprocal space maps of tensile deformed copper, individual, almost dislocation-free subgrains are identified from high-intensity peaks and distinguished by their unique combination of orientation and elastic strain; dislocation walls manifest themselves as a smooth cloud of lower intensity. The elastic strains show only minor variations within each subgrain, but larger variations between different subgrains. In average, subgrains experience back strains, whereas dislocations walls are strained in forward direction. Based on these observations a revision of the classical composite model is formulated. Additionally, subgrain dynamics is followed in-situ during varying loading conditions by reciprocal space mapping: During uninterrupted tensile deformation, formation of subgrains can be observed concurrently with broadening of Bragg reflections shortly after onset of plastic deformation. The emergence of dislocation-free regions proofs that ordered dislocation structures develop during tensile deformation. With continued tensile deformation, the subgrain structure develops intermittently. When the traction is terminated, stress relaxation occurs and no changes in the number, size and orientation of the subgrains are observed. When changing the tensile direction after pre-deformation in tension, a systematic correlation between the degree of strain path change and the volume fraction of the subgrains is established. In case of perpendicular tensile axes, a reversal of the radial profile asymmetry is observed and explained. Proceedings of the 31st Riso International Symposium on Materials Science: Challenges in materials science and possibilities in 3D and 4D characterization techniques Editors: N. Hansen, D. Juul Jensen, S.F. Nielsen, H.F. Poulsen and B. Ralph Riso National Laboratory for Sustainable Energy, Technical University of Denmark, 2010" @default.
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- W2615177316 date "2010-01-01" @default.
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- W2615177316 title "Advances in characterization of deformation structures by high resolution reciprocal space mapping" @default.
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