In-situ observations of R-phase transformation in a Ti50Ni48Fe2 alloy by electron microscopy

T. Tamiya, D. Shindo, Yasukazu Murakami, Y. Bando, K. Otsuka

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    37 Citations (Scopus)


    The R-phase transformation in a Ti50Ni48Fe2 alloy was studied by in-situ electron microscopy with double-tilt cooling stages and an energy-filter, and the controversial incommensurability in the early stage of the transformation was examined by using imaging plates, which have high sensitivity and are easy to access to computer analysis. As a result, the transformation was shown to proceed in the following way. The R-phase transformation starts at Rs point, where the electrical resistance starts to increase, from the B2 parent phase with weak diffuse scattering to the commensurate R-phase with a sharp interface. Thus, the transformation is a first order throughout, and the temperature hysteresis represents the two-phase region of the B2 parent and the commensurate R-phase.

    Original languageEnglish
    Pages (from-to)714-723
    Number of pages10
    JournalMaterials Transactions, JIM
    Issue number7
    Publication statusPublished - 1998 Jul


    • Commensurate
    • Electron microscopy
    • Energy-filtering
    • Imaging plate
    • Incommensurate
    • Martensitic transformation
    • R-phase transformation
    • Shape memory effect
    • Superlattice
    • Titanium-nickel-iron alloy

    ASJC Scopus subject areas

    • Engineering(all)


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