In-situ Observations of R-Phase Transformation in a Ti50Ni48Fe2 Alloy by Electron Microscopy

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  • Tamiya T.
    Institute of Materials Science, University of Tsukuba
  • Shindo D.
    Institute for Advanced Materials Processing, Tohoku University
  • Murakami Y.
    Institute for Advanced Materials Processing, Tohoku University
  • Bando Y.
    National Institute for Research in Inorganic Materials
  • Otsuka K.
    Institute of Materials Science, University of Tsukuba

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タイトル別名
  • <I>In-situ</I> Observations of R-Phase Transformation in a Ti<SUB>50</SUB>Ni<SUB>48</SUB>Fe<SUB>2</SUB> Alloy by Electron Microscopy
  • In-situ Observations of R-Phase Transfo

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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.

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