The role of antiphase boundaries in the kinetic process of the L12 → D022 structural change of an Ni3Al0.45V0.50 alloy

Makoto Tanimura, Yasumasa Koyama

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    The influence of antiphase boundaries (APBs) on the kinetic process of the L12 → D022 structural change in an Ni3Al0.45V0.50 alloy has been investigated by transmission electron microscopy. The structural change includes two kinetic factors, i.e., the periodic introduction of antiphase-shifted planes (APSPs) in the L12 structure and V diffusion in the L12 matrix. Our results revealed that APB migration was accompanied by V diffusion as if to sweep the V atoms out of the antiphase domains (APDs). It was also found that the APBs served as the nucleation sites of the D022 regions, because the combination of the migrated APBs produced the APSPs in the L12 structure. On this basis, it is proposed that the APBs bring together the two kinetic factors in the process of the L12 → D022 structural change, the physical origin of which is the variation in the charge density distribution of the APDs due to APB migration.

    Original languageEnglish
    Pages (from-to)4385-4391
    Number of pages7
    JournalActa Materialia
    Volume54
    Issue number16
    DOIs
    Publication statusPublished - 2006 Sep

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    Kinetics
    Charge density
    Nucleation
    Transmission electron microscopy
    Atoms

    Keywords

    • Diffusion in ordered structures
    • Isothermal heat treatments
    • Nickel alloys
    • Phase transformation kinetics
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Materials Science(all)
    • Metals and Alloys

    Cite this

    The role of antiphase boundaries in the kinetic process of the L12 → D022 structural change of an Ni3Al0.45V0.50 alloy. / Tanimura, Makoto; Koyama, Yasumasa.

    In: Acta Materialia, Vol. 54, No. 16, 09.2006, p. 4385-4391.

    Research output: Contribution to journalArticle

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