Abstract
The phase equilibria of Gd-Fe-Cr system were investigated at 800 degrees C by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). The isothermal section of the phase diagram consisted of eight single-phase regions, eight two-phase regions and seven three-phase regions. The binary compounds GdFe2, GdFe3, Gd2Fe17, s(FeCr) and the ternary compound GdFe10Cr2 were confirmed. Conversely, the binary compound Gd6Fe23 was unstable at the level of 800 degrees C. The maximum solid solubilities of Cr in GdFe2 and Gd2Fe17 were about 11.7 and 13.2 at. % Cr respectively. The compound GdFe12-xCrx with the ThMn12-type structure (space group I4/mmm) has a broad solubility ranging from 15.4 to 23.1 at. % Cr. (c) 2019 Published by Elsevier B.V.