Abstract
Abstract The solid state phase equilibria in the Dy–Nb–Si ternary system at 1 273 K were experimentally determined by means of X-ray powder diffraction, differential scanning calorimetry and scanning electron microscopy equipped with energy dispersive X-ray analysis in the whole compositional range. The isothermal section of the Dy–Nb–Si ternary phase diagram contains 12 single-phase regions, 22 two-phase regions and 11 three-phase regions. At 1 273 K, the highest solubilities of Nb in β-DySi2, β-DySi1.67, Dy3Si4, β-DySi, Dy5Si4 and Dy5Si3 are extremely low (all less than 1 at.%). Whereas the maximum solubilities of Dy in NbSi2 and Nb5Si3 are approximately confirmed to be 1.12 at.% and 1.33 at.% Dy, respectively. Combining differential scanning calorimetry results with X-ray powder diffraction analysis, it is proved that the transformation temperatures of β-DySi1.67→α-DySi1.67 and Dy3Si4→β-DySi1.67 + β-DySi are 980 K and 1 480 K, respectively.
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