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Phase equilibrium in Nb-Si-Mo ternary alloys (<37.5 at.% Si) at 1 273 K and 2 073 K is investigated by using X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The partial isothermal section at 1 273 K, which contains four single-phase regions, five two-phase regions and two three-phase regions, is basically the same as that at 1 973 K. However, when the temperature increases to 2 073 K, the three-phase region of Nbss+α-(Nb(Mo))5Si3+β-(Nb,Mo)5Si3 obvi-ously moves towards the Nb-rich corner. This suggests that Nb-Si-Mo ternary alloys remain stable at least up to 1 973 K.
Phase equilibrium in Nb-Si-Mo ternary alloys (<37.5 at% Si) at 1 273 K and 2 073 K is investigated by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy EDS). The partial isothermal section at 1 273 K, which contains four single-phase regions, five two-phase regions and two three-phase regions, is basically the same as that at 1 973 K. However, when the temperature increases to 2 073 K, the three-phase region of Nbss + α- (Nb (Mo)) 5Si3 + β- (Nb, Mo) 5Si3 obvi-ously moves toward the Nb- rich corner. This suggests that Nb-Si-Mo ternary alloys remain stable at least up to 1 973 K.