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The effect of O on the phase equilibria in Nb–Fe–Cr alloys, more specifically on the formation of a Ti 2 Ni type phase, has been studied. Nb–xFe–yCr alloys with × = 37.4 – 41.4 at.%, y = 7.6 – 8.6 at.% were subjected to long term annealing experiments at 950 8C after oxygenation. The phases were identified and characterized using scanning electron microscopy, X-ray diffraction and wavelength dispersive spectroscopy. In the pure Nb-37Fe-8Cr and Nb-41Fe-9Cr alloys respectively a two phase equilibrium between (Nb) and l FeNb and a three phase equilibrium between (Nb), l FeNb and Fe 2 Nb are established. In the oxygenated alloys a Ti 2 Ni type phase with composition (Fe, Cr) 6 Nb 6 O x  appears mainly at the expense of the l FeNb phase. With respect to composition and crystallographic parameters the (Fe, Cr) 6 Nb 6 O x  phase has large similarities with the Fe 2.4 Nb 3.6 O and Fe 6 Nb 6 O phase. From wavelength dispersive spectroscopy measurements, it is concluded that × equals 0.75 when (Fe, Cr) 6 Nb 6 O x  is in equilibrium with (Nb), l FeNb and Fe 2 Nb. × is higher when this phase is in equilibrium with NbO. The structure of (Fe, Cr) 6 Nb 6 O x  is also analyzed with Rietveld refinement. This analysis reveals that Cr atoms partially replace Fe atoms only on the 16d site and not on the 32e site.

(Fe, Cr) 6 Nb 6 O x phase of the filled Ti 2 Ni type with × ± 0.75 in the quaternary Cr–Fe–Nb–O system