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. (C) 2007 Elsevier B.V. All rights reserved.
|Journal||Materials Science & Engineering: A|
|Publication status||Published - 2008|
|Event||Symposium on Advances in Microstructure-Based Modeling and Characterization of Deformation Microstructures : TMS 2007 Annual Meeting - Orlando,FL, United States|
Duration: 26 Feb 2007 → 28 Feb 2007
|Conference||Symposium on Advances in Microstructure-Based Modeling and Characterization of Deformation Microstructures : TMS 2007 Annual Meeting|
|Period||26/02/2007 → 28/02/2007|