Directionally-solidified dendrite morphology with eight secondary arms in an FCC ordered phase alloy

Yuhi Mori, Hiroshi Harada, Tadaharu Yokokawa, Toshiharu Kobayashi, Shinsuke Suzuki

    Research output: Contribution to journalArticle

    Abstract

    We found a new dendritic solidification morphology with secondary arms growing in eight directions rather than the 〈1 0 0〉 directions expected for a face-centered cubic (FCC) alloy. A bulk single crystal of a Ni-base γ′ single-phase alloy was cast by withdrawing method in a directional solidification furnace. The solidification structure was observed using scanning electron microscopy and analyzed using electron back-scatter diffraction. These results demonstrated that the growth direction of the primary dendrites was [0 0 1], which is known to be the preferred growth direction for FCC metals and alloys. However, the primary dendrite had eight secondary arms growing in the high-Miller-index directions between 〈1 0 0〉 and 〈1 1 0〉. The main factor behind this new dendrite morphology is likely to be the anisotropic atomic stacking of L12 ordered phase, which is the primary phase of the investigated alloy.

    Original languageEnglish
    Pages (from-to)15-22
    Number of pages8
    JournalJournal of Crystal Growth
    Volume500
    DOIs
    Publication statusPublished - 2018 Oct 15

    Fingerprint

    dendrites
    Solidification
    solidification
    Dendrites (metallography)
    cast alloys
    Furnaces
    Diffraction
    Single crystals
    furnaces
    Scanning electron microscopy
    Metals
    Direction compound
    Electrons
    scanning electron microscopy
    single crystals
    diffraction
    metals
    electrons

    Keywords

    • A1. Crystal structure
    • A1. Dendrites
    • A1. Directional solidification
    • A2. Growth from melt
    • A2. Single crystal growth
    • B1. Alloys

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Inorganic Chemistry
    • Materials Chemistry

    Cite this

    Directionally-solidified dendrite morphology with eight secondary arms in an FCC ordered phase alloy. / Mori, Yuhi; Harada, Hiroshi; Yokokawa, Tadaharu; Kobayashi, Toshiharu; Suzuki, Shinsuke.

    In: Journal of Crystal Growth, Vol. 500, 15.10.2018, p. 15-22.

    Research output: Contribution to journalArticle

    Mori, Yuhi ; Harada, Hiroshi ; Yokokawa, Tadaharu ; Kobayashi, Toshiharu ; Suzuki, Shinsuke. / Directionally-solidified dendrite morphology with eight secondary arms in an FCC ordered phase alloy. In: Journal of Crystal Growth. 2018 ; Vol. 500. pp. 15-22.
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    AU - Harada, Hiroshi

    AU - Yokokawa, Tadaharu

    AU - Kobayashi, Toshiharu

    AU - Suzuki, Shinsuke

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