Phase equilibria in Ni-Ti-Ta ternary system

Phase diagrams of two isothermal sections of the Ni-Ti-Ta ternary system at 1000 and 1200 degrees C in a full composition range were determined by X-ray diffraction and electron probe microanalysis. The experimental results indicated a ternary compound tau phase with low solid solubility and composition ranges of (16.3-22.4) at.% Ta, (15.9-24.1) at.% Ti and (58.5-60.0) at.% Ni at 1000 degrees C. The two terminal solid solutions (bcc-(Ta) and beta-Ti) formed a continuous solid solution at 1000 and 1200 degrees C. A certain amount of Ti can dissolve into Ni-Ta intermetallic compounds near the Ni-Ta side, with the highest value of 21.9 at.% observed in the Ni2Ta compound at 1000 degrees C.

Automated summary

The phase diagrams of the Ni-Ti-Ta ternary system were determined at 1000 and 1200 degrees C using X-ray diffraction and electron probe microanalysis. The experimental results revealed the presence of a ternary compound called tau phase with low solid solubility at 1000 degrees C. The terminal solid solutions formed a continuous solid solution at both temperatures.