Differential thermal analysis, X-ray diffraction, and metallography are employed to examine the phase equilibria in the Ti–Ti5Si3–Dy5Si3–Dy region of the Ti–Dy–Si system. Isothermal sections at 1100 and 900°C, vertical sections at 5Si, 65Ti, and 65Dy isopleths, and a reaction scheme are constructed. The ternary compound TiDySi (τ) exists at experimental temperatures and has no appreciable homogeneity range. The isothermal sections at 1100 and 900°C are similar and characterized by five three-phase regions (β + (α-Dy) + τ, β + (Ti3Si) + τ, (Ti3Si) + τ + (Ti5Si3), (α-Dy) + τ + (Dy5Si3), and (Ti5Si3) + τ + (Dy5Si3)) and respective two-phase fields. Three invariant four-phase equilibria are found in solid state: β + (Ti5Si3) ⇄ (Ti3Si) + τ (U3), β + τ + (Ti3Si) ⇄ α (P2), and β + τ + (α-Dy) ⇄ α (P3) at ~1150, 900, and 885°C, respectively. There is also a threephase equilibrium, β + τ ⇄ α, at 845°C (p4). The phase equilibria are summarized in the reaction scheme.
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Translated from Poroshkovaya Metallurgiya, Vol. 54, No. 7–8 (504), pp. 93–104, 2015
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Bulanova, M.V., Fartushna, Y.V., Meleshevich, K.A. et al. Phase Equilibria in the Ti–Ti5Si3–Dy5Si3–Dy Region of the Ti–Dy–Si System. Powder Metall Met Ceram 54, 455–464 (2015). https://doi.org/10.1007/s11106-015-9736-1
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DOI: https://doi.org/10.1007/s11106-015-9736-1