The isothermal section of the phase diagram of the Dy–Mn–Ni ternary system at 803 K

Abstract

The isothermal section of the phase diagram of the ternary system Dy–Mn–Ni system at 803 K was investigated by powder X-ray diffraction (XRD), differential thermal analysis (DTA), optical microanalysis and electron probe microanalysis techniques. It consists of 13 single-phase regions, 22 two-phase regions and 10 three-phase regions. At 803 K, the maximum solid solubilities of Mn in Ni, Dy 2Ni 17, DyNi 5, Dy 2Ni 7, DyNi 3, DyNi, Dy 3Ni 2 and Dy 3Ni are about 31at.% Mn, 6 at.% Mn, 5.5 at.% Mn, 3 at.% Mn, 5 at% Mn, 5 at.% Mn, 3 at.% Mn and 1.5 at.% Mn, respectively. The maximum solid solubilities of Ni in Mn, DyMn 12 and Dy 6Mn 23 are about 2.6 at.% Ni, 2 at.% Ni and 4 at.% Ni, respectively. DyMn 2 and DyNi 2 form a continous solid solution in this system. The binary compounds DyNi 4 and Dy 4Ni 17 were not observed in this work. The existence of any ternary compound was not observed.