Abstract
The solid state phase equilibria in the Fe–Pt–Dy ternary system at 900 °C (Dy ≤ 75 at.%) were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersion spectroscopy (EDS) techniques. It is found that the 900 °C isothermal section consists of 18 single-phase regions, 33 two-phase regions and 16 three-phase regions. At 900 °C, it is observed that the maximum solid solubility of Pt in Fe 2Dy and α-(Fe, Dy) is 5 at.% Pt and 3 at.% Pt, respectively. The binary phase Fe 5Dy was not observed. The existence of DyPt 5, DyPt 3, DyPt 2, Dy 3Pt 4, DyPt, Dy 5Pt 4, Dy 5Pt 3, Dy 2Pt and Dy 3Pt compounds is confirmed and the maximum solubility of Fe in them is below 1 at.% Fe; the maximum solubility of Dy in α-(Fe, Pt), γ-(Fe, Pt), FePt, FePt 3 and (Pt, Fe) (the solid solution of Fe in Pt) is 3 at.% Dy, 2 at.% Dy, 2 at.% Dy, 1.5 at.% Dy and 1.5 at.% Dy, respectively.
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