Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 32, Issue 4, Pages 1178-1187Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(22)65865-5
Keywords
microstructure; Ni-Ti-Ta ternary system; isothermal section phase diagram; electron probe microanalysis
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Funding
- National Natural Science Foundation of China [51831007]
- National Key R&D Program of China [2017YFB0702901]
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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.
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.
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