The role of deformation microstructure in recovery and recrystallization of heavily strained metals

Niels Hansen

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    Metals deformed to high and ultrahigh strains are characterized by a nanoscale microstructure, a large fraction of high angle boundaries and a high dislocation density. Another characteristic of such a microstructure is a large stored energy that combines elastic energy due to dislocations and boundary energy. Parameters of the deformed microstructure significantly affect annealing processes such as recovery and recrystallization. For example, the recovery rate can be significantly increased after high strain deformation and restoration may occur as either discontinuous recrystallization or structural coarsening. A characterization and analysis of deformed and annealed microstructures presented in this work covers Al, Ni, Cu and Fe heavily deformed by rolling, accumulative roll bonding (ARB), equal channel angular extrusion (ECAE) and high pressure torsion (HPT). The important effect of recovery on subsequent restoration processes is discussed along with the effect of heterogeneities both on the local scale and on the sample scale. © (2012) Trans Tech Publications, Switzerland.
    Original languageEnglish
    JournalMaterials Science Forum
    Volume715-716
    Pages (from-to)251-258
    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

    • Compressible flow
    • Grain growth
    • Recovery
    • Recrystallization (metallurgy)
    • Restoration
    • Roll bonding
    • Thermodynamic stability
    • Microstructure

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