Structural Study of R-Phase in Ti-50.23 at.%Ni and Ti-47.75 at.%Ni-1.50 at.%Fe Alloys

Toru Hara; Takuya Ohba; Eiji Okunishi; Kazuhiro Otsuka

doi:10.2320/matertrans1989.38.11

Toru Hara, Takuya Ohba, Eiji Okunishi, Kazuhiro Otsuka

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Keywords: titanium-nickel, titanium-nickel(-X), R-phase, martensite, crystal structure, transmission electron microscopy, X-ray diffraction, the Rietveld method, convergent beam electron diffraction

JOURNAL FREE ACCESS

1997 Volume 38 Issue 1 Pages 11-17

DOI https://doi.org/10.2320/matertrans1989.38.11

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Abstract

The crystal structure of the R-phase was determined by combined use of the electron diffraction and the powder X-ray diffraction method. The Rietveld method was applied for the analysis of the powder diffraction data. The structure of the R-phase belongs to the space group P3 and is similar to that of ζ′₂ Au–Cd martensite. The deviations of the atomic coordinates from the mirror plane of the P\bar31m are smaller than that of ζ′₂ Au–Cd. The convergent beam electron diffraction patterns were also observed and discussed with the results.

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