Microstructure evolution in the phase separation of the Ni 3Al0.40v0.60 alloy

Makoto Tanimura, Toshihiro Doi, Yasumasa Koyama

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    It has been found that phase separation, i.e., D022 precipitation in the supersaturated L12 matrix to form the L1 2 + D022 equilibrium state, stagnates in the Ni 3Al0.52V0.48 alloy under a certain thermodynamic condition. This stagnation originates from the suppression of the long-range vanadium diffusion in the LI: matrix, so-called diffusion blocking. Because diffusion blocking is inherent to the L12 structure, its occurrence depends largely on the morphological features of the L12 matrix. In this study, the microstructure evolution during the phase separation of the Ni3Al0.40 V0.60 alloy was examined from the viewpoint of the relation between the variation in the initial microstructure and the appearance of the effect of diffusion blocking. Our results showed that cuboidal domains of about 30 nm on a side formed in the initial L12 matrix and that the D022 regions appeared at the domain boundaries. The microstructure evolution of the alloy was found to proceed via the rearrangement, combination, and growth of these D022 regions, accompanying vanadium migration of about 20nm in the L12 matrix. The requisite migration length was determined by the size and density of the initial D022 regions, which depend on the size of the L1 2 cuboidal domains. A shorter migration length than that in the case of the Ni3Al05.2V0.48 alloy was presumed to be advantageous to concealing the effect of diffusion blocking. On that basis, it was concluded that the occurrence of the phase separation in the Ni 3Al0.40V0.60 alloy was attributed to the reduction in the size of the cuboidal domains in the initial L12 matrix.

    Original languageEnglish
    Pages (from-to)2988-2996
    Number of pages9
    JournalMaterials Transactions
    Volume46
    Issue number12
    DOIs
    Publication statusPublished - 2005 Dec

    Fingerprint

    Phase separation
    microstructure
    Microstructure
    matrices
    Vanadium
    vanadium
    occurrences
    Thermodynamics
    retarding
    thermodynamics

    Keywords

    • Atomic diffusion
    • Microstructure evolution
    • Nickel aluminum vanadium alloy
    • Ordered structure
    • Phase separation
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Materials Science(all)
    • Metals and Alloys

    Cite this

    Microstructure evolution in the phase separation of the Ni 3Al0.40v0.60 alloy. / Tanimura, Makoto; Doi, Toshihiro; Koyama, Yasumasa.

    In: Materials Transactions, Vol. 46, No. 12, 12.2005, p. 2988-2996.

    Research output: Contribution to journalArticle

    Tanimura, Makoto ; Doi, Toshihiro ; Koyama, Yasumasa. / Microstructure evolution in the phase separation of the Ni 3Al0.40v0.60 alloy. In: Materials Transactions. 2005 ; Vol. 46, No. 12. pp. 2988-2996.
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