Microstructure of individual grains in cold-rolled aluminium from orientation inhomogeneities resolved by electron backscattering diffraction |
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Authors: | W He W Ma W Pantleon |
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Affiliation: | aCenter for Fundamental Research: Metal Structures in Four Dimensions, Materials Research Department, Risø National Laboratory, Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark |
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Abstract: | The deformation structure within individual grains of a deformed material is resolved by electron backscattering diffraction. The employed evaluation scheme for local orientation data is illustrated on cold-rolled aluminium. The orientation distribution of each grain is characterized by an averaged orientation spread and its anisotropy; the dependence of both parameters on grain size and grain orientation is discussed. The preferred rotation axis in each grain is determined and shows a dominant orientation spreading around the transversal direction. Characteristic features of the deformation structure (as alternating orientation differences or orientation gradients) are resolved from sign-carrying disorientation angles defined with respect to the preferred rotation axis in each grain. Five components of the dislocation density tensor – corresponding to part of the geometrically necessary dislocation content – are inferred from the local curvatures. The spatially inhomogeneous distribution of the dislocation density offers a new possibility for identifying dislocation boundaries. |
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Keywords: | Deformation structure EBSD Orientation map Orientation spread Disorientation Dislocation density |
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