The use of combined cathodoluminescence and EBSD analysis: A case study investigating grain boundary migration mechanisms in quartz

Sandra Piazolo*, D. J. Prior, M. D. Holness

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    29 Citations (Scopus)

    Abstract

    Grain boundary migration is an important mechanism of microstructural modification both in rocks and in metals. Combining detailed cathodoluminescence (CL) and electron backscatter diffraction (EBSD) analysis offers the opportunity to relate directly changes in crystallographic orientation to migrating boundaries. We observe the following features in naturally heated quartz grains from the thermal aureole of the Ballachulish Igneous Complex (Scotland, U.K.): (a) propagation of substructures and twin boundaries in swept areas both parallel and at an angle to the growth direction, (b) development of slightly different crystallographic orientations and new twin boundaries at both the growth interfaces and within the swept area and (c) a gradual change in crystallographic orientation in the direction of growth. All these features are compatible with a growth mechanism in which single atoms are attached and detached both at random and at preferential sites, i.e. crystallographically controlled sites or kinks in boundary ledges. Additionally, strain fields caused by defects and/or trace element incorporation may facilitate nucleation sites for new crystallographic orientations at distinct growth interfaces but also at continuously migrating boundaries. This study illustrates the usefulness of combined CL and EBSD in microprocess analysis. Further work in this direction may provide detailed insight into both the mechanism of static grain growth and the energies and mobilities of boundaries in terms of misorientation and grain boundary plane orientation.

    Original languageEnglish
    Pages (from-to)152-161
    Number of pages10
    JournalJournal of Microscopy
    Volume217
    Issue number2
    DOIs
    Publication statusPublished - Feb 2005

    Keywords

    • Cathodoluminescence
    • Crystallographic orientation
    • Dauphiné twin
    • EBSD
    • Grain boundary migration
    • Grain growth
    • Static annealing
    • Subgrain

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