Experimental study of the influence of stress, temperature, and strain on the dynamic recrystallization of Carrara marble

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    Abstract

    Carrara marble has been deformed experimentally at temperatures ranging between 500° and 1000°C, at confining pressures of 200 and 300 MPa, and up to very large strains in extension and compression, in order to study the microstructural and mechanical property changes associated with dynamic recrystallization. When the temperature is sufficiently high (~600°C) and the stresses are high enough for deformation twinning to occur, twin boundary migration is a powerful recrystallization mechanism that does not modify the grain size. At stress levels too low to activate twinning, recrystallization occurs in two stages: the formation of nuclei by grain boundary bulging and subgrain rotation recrystallization in the grain boundary regions, followed by a second stage of grain boundary migration recrystallization to a larger grain size that eventually overprints the entire rock volume. The size to which migration-recrystallized grains grow seems to be limited by the stress and grain size dependent twinning field boundary or by the boundary between the dislocation creep and grain size sensitive flow mechanisms. -from Author
    Original languageEnglish
    Pages (from-to)24-663
    Number of pages639
    JournalJournal of Geophysical Research: Atmospheres
    Volume100
    Issue number12
    Publication statusPublished - 1995

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