The melting diagram of the Ti-Dy-Si system in the Ti-Ti_5Si_3-Dy_5Si_3-Dy region

摘要

The phase equilibria in the Ti-Ti_5Si_3-Dy_5Si_3-Dy part of the Ti-Dy-Si system were studied by DTA, X-ray diffraction, metallography and EPMA. The melting diagram, isopleths at 5Si, 65Ti and 65Dy, and a reaction scheme were constructed. The solidus surface is characterized by the following three-phase fields: + + ++ , + + + < = > + and L+ < = > + (alpha-Dy), at 1320 and 1170 deg C, respectively. The third three-phase field results from an invariant eutectic four-phase equilibrium, L < = > + + , at 1157 + - 6 deg C The fourth one is the result of a P-type equilibrium, L+ + < = > . The temperature of the latter was estimated to be within the interval 1650-1700 deg C.