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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-Zr2(Mo,Fe), derived from Ti2Ni type Zr4Fe2O, 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-Zr2(Mo,Fe) + ZrMo2], [βZr + λ-Zr(Mo,Fe)2 + γ-Zr2(Mo,Fe) + Liquid], and [λ-Zr(Mo,Fe)2 + γ-Zr2(Mo,Fe) + Liquid + ZrFe2]. The previously detected Zr9Mo4Fe compound was not observed in this work. [ABSTRACT FROM AUTHOR]

Accurate composition-dependent interdiffusion coefficients, modulus and hardness data are important for the design of biomedical Ti alloys. Three groups of body-centered cubic (bcc) Ti-Mo-Zr diffusion couples annealed at 1273 K for 7 d were experimentally prepared, and their composition gradients were determined by using the electron probe microanalysis (EPMA). The composition-dependent interdiffusion coefficients of Ti-Mo-Zr alloys were calculated by using a pragmatic numerical inverse method and Matano-Kirkaldy method. Subsequently, nanoindentation technique combined with the reverse analysis algorithms and Oliver-Pharr method was utilized to obtain the mechanical properties of the ternary diffusion couples. Finally, other property data including indirect wear resistance parameters, bulk modulus, and shear modulus were discussed. The composition-dependent mechanical property database of bcc Ti-Mo-Zr system can offer a guide for the design of Ti alloys. [ABSTRACT FROM AUTHOR]