Microstructural evolution during initial stages of static recovery and recrystallization

New insights from in-situ heating experiments combined with electron backscatter diffraction analysis

Michel Bestmann*, Sandra Piazolo, Chris J. Spiers, David J. Prior

*Corresponding author for this work

    Research output: Contribution to journalArticle

    54 Citations (Scopus)

    Abstract

    We present in-situ observations, performed using electron backscatter diffraction, of static recovery and recrystallization processes occurring in a plastically deformed geological material, namely rocksalt. Static heating experiments, carried out in a scanning electron microscope at temperatures of up to 450 °C, allowed direct detailed observations of grain boundary migration between substructured grains in deformed polycrystalline samples. Contrary to expectations, crystallographic orientation maps reveal that behind slowly migrating grain boundaries new subgrain boundaries form while pre-existing subgrain boundaries are sometimes inherited. Moreover, the crystallographic character, especially the preferred orientation of misorientation axes of the new substructures reflects the character of the previous deformation history. These results imply that substructural features, such as subgrain misorientation distributions, may be relatively robust indicators of deformation mechanisms and conditions, even in tectonites that have undergone late, static recrystallization. In addition, our observations suggest that the process of static grain boundary migration does not necessarily reset earlier deformation microstructures as commonly assumed. The kinematic observations of boundary migrations are inconsistent with simple models in which migration is achieved by single atoms jumping across the boundary.

    Original languageEnglish
    Pages (from-to)447-457
    Number of pages11
    JournalJournal of Structural Geology
    Volume27
    Issue number3
    DOIs
    Publication statusPublished - Mar 2005

    Keywords

    • Electron backscatter diffraction
    • Grain boundary migration
    • In-situ heating
    • Microstructure
    • Rocksalt

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