Phase Relationship in the Zr-Mo-Fe(O) System (Zr > 30 at.%) at 1000 °C

The impact of oxygen impurity on phase relationships in the Zr-Mo-Fe system (Zr > 30 at.%) at 1000 °C was investigated by means of x-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy analysis. An oxygen-stabilized ternary compound γ-Zr 2 (Mo,Fe), derived from Ti 2 Ni type Zr 4 Fe 2 O, with cell parameter of a = 1.2213 nm was observed to be present in the investigated Zr-Mo-Fe alloys. The phase relationships of the Zr-Mo-Fe (O) system at 1000 °C in the Zr-rich corner consist of 3 four-phase regions, i.e., [βZr + λ-Zr(Mo,Fe) 2 + γ-Zr 2 (Mo,Fe) + ZrMo 2 ], [βZr + λ-Zr(Mo,Fe) 2 + γ-Zr 2 (Mo,Fe) + Liquid], and [λ-Zr(Mo,Fe) 2 + γ-Zr 2 (Mo,Fe) + Liquid + ZrFe 2 ]. The previously detected Zr 9 Mo 4 Fe compound was not observed in this work.