EBSD-based techniques for characterization of microstructural restoration processes during annealing of metals deformed to large plastic strains

A. Godfrey, Oleg Mishin, Tianbo Yu

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    Abstract

    Some methods for quantitative characterization of the microstructures deformed to large plastic strains both before and after annealing are discussed and illustrated using examples of samples after equal channel angular extrusion and cold-rolling. It is emphasized that the microstructures in such deformed samples exhibit a heterogeneity in the microstructural refinement by high angle boundaries. Based on this, a new parameter describing the fraction of regions containing predominantly low angle boundaries is introduced. This parameter has some advantages over the simpler high angle boundary fraction parameter, in particular with regard to data collected from electron-backscatter diffraction investigations, where boundaries with very low misorientation angles cannot be reliably detected. It is shown how this parameter can be related to the recrystallization behavior. Another parameter, based on mode of the distribution of dislocation cell sizes is outlined, and it is demonstrated how this parameter can be used to investigate the uniformity, or otherwise, of the restoration processes occurring during annealing of metals deformed to large plastic strains. © (2012) Trans Tech Publications, Switzerland.
    Original languageEnglish
    JournalMaterials Science Forum
    Volume715-716
    Pages (from-to)203-210
    ISSN0255-5476
    DOIs
    Publication statusPublished - 2012
    Event4th International Conference on Recrystallization and Grain Growth - Sheffield, United Kingdom
    Duration: 4 Jul 20109 Jul 2010

    Conference

    Conference4th International Conference on Recrystallization and Grain Growth
    Country/TerritoryUnited Kingdom
    CitySheffield
    Period04/07/201009/07/2010

    Keywords

    • Annealing
    • Coarsening
    • Crystallization
    • Grain growth
    • Microstructure
    • Plastic deformation
    • Recrystallization (metallurgy)
    • Restoration
    • Metal analysis

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