An investigation of the Dy–Fe–Cr phase diagram: Phase equilibria at 773K

Abstract: Phase equilibria in the Dy–Fe–Cr system were investigated by X-ray powder diffraction (XRD), differential thermal analysis (DTA), scanning electron microscopy (SEM) techniques and the isothermal section at 773K was obtained. It consists of 8 single-phase regions, 14 two-phase regions and 7 three-phase regions. The existence of the compound DyFe12−x Cr x (1.6≤ x ≤3.0, space group I4/mmm) with ThMn12-type structure was confirmed. The maximum solid solubility of Cr in Fe, Dy2Fe17, Dy6Fe23, DyFe3 and DyFe2 is about 15, 13, 6, 5 and 16at.%, respectively. [Copyright &y& Elsevier]