Microstructure of individual grains in cold-rolled aluminium from orientation inhomogeneities resolved by electron backscattering diffraction

Wei He, Weitao Ma, Wolfgang Pantleon

    Research output: Contribution to journalConference articleResearchpeer-review

    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. (C) 2007 Elsevier B.V. All rights reserved.
    Original languageEnglish
    JournalMaterials Science & Engineering: A
    Volume494
    Issue number1-2
    Pages (from-to)21-27
    ISSN0921-5093
    DOIs
    Publication statusPublished - 2008
    EventSymposium on Advances in Microstructure-Based Modeling and Characterization of Deformation Microstructures : TMS 2007 Annual Meeting - Orlando,FL, United States
    Duration: 26 Feb 200728 Feb 2007

    Conference

    ConferenceSymposium on Advances in Microstructure-Based Modeling and Characterization of Deformation Microstructures : TMS 2007 Annual Meeting
    CountryUnited States
    CityOrlando,FL
    Period26/02/200728/02/2007

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