DISLOCATION DYNAMICS IN VANADIUM - A NUCLEAR-MAGNETIC-RESONANCE AND TRANSMISSION ELECTRON-MICROSCOPIC STUDY

A CHRISTIAN*, O KANERT, JTM DEHOSSON

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

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    Abstract

    Pulsed nuclear magnetic resonance proved to be a complementary new technique for the study of moving dislocations in b.c.c. metals. From the motion induced part of the spin-lattice relaxation rate the mean jump distance of mobile dislocations has been measured in Vanadium as a function of temperature. The NMR experiments are combined with transmission electron microscopic investigations to reveal the static structure of defects in the samples. The NMR experiments show that the mean jump distance is nearly constant below 230 K whereas it decreases substantially above 230 to 300 K indicating a transition that marks two different mechanisms. NMR observations in combination with TEM support the physical picture that above the transition temperature dislocation segments are stopped between localized obstacles whereas below T(c) the lattice friction controls the plastic behaviour.

    Original languageEnglish
    Pages (from-to)2479-2484
    Number of pages6
    JournalActa Metallurgica et Materialia
    Volume38
    Issue number12
    Publication statusPublished - Dec-1990

    Keywords

    • SINGLE-CRYSTALS
    • ANOMALOUS SLIP
    • ALLOYS
    • DEFORMATION
    • TANTALUM
    • MOLYBDENUM
    • ALUMINUM

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