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The local atomic structure near an Nb atom in a Ti–20 at. %Nb alloy single crystal, which consists of the  β ,  α ′′ and  ω  Ti phases, was investigated by means of X-ray fluorescence holography (XFH). The atomic images were reconstructed in the vicinity of an Nb atom, which is one of the typical  β  stabilizing elements in  β  Ti alloys. Most atoms in the  β  Ti primary phase were reconstructed clearly. The atoms in the  α ′′ Ti martensite phase could not be reconstructed, because the  α ′′ Ti martensite has the crystal structure with low symmetry. Some atoms in the  ω  Ti fine precipitates were reconstructed successfully, although the amount of the  ω  Ti phase was much smaller than that of the  β  phase. An Nb atom and its first nearest neighbors tend to keep the BCC structure even upon the  ω  Ti phase formation.

X-ray Fluorescence Holography for a Ti–Nb Binary Alloy Consisting of the Martensite, Austenite and Omega Phase