Isothermal section of the Y–Fe–Cr ternary system at 773 K

The isothermal section of the phase diagram of the Y–Fe–Cr ternary system at 773 K was investigated by X-ray powder diffraction (XRD), optical microscopy, differential thermal analysis (DTA), scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS). The isothermal section consists of 8 single-phase regions, 14 two-phase regions and 7 three-phase regions. The maximum solid solubilities of Cr in Fe, Y2Fe17, Y6Fe23 and YFe2 are 13, 18, 6 and 6 at.% Cr, respectively. The maximum solid solubility of Fe in Cr is about 15 at.% Fe. It was found that there is some homogeneity range in the ternary compound of YFe12−xCrx with x = 2.1–3.4 at 773 K.