中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 32 No. 4 April 2022 |
（1. Fujian Provincial Key Laboratory of Materials Genome, College of Materials, Xiamen University, Xiamen 361005, China;
2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;
3. Institute of Materials Genome and Big Data, Harbin Institute of Technology, Shenzhen 518055, China）
Abstract:Phase diagrams of two isothermal sections of the Ni-Ti-Ta ternary system at 1000 and 1200 °C in a full composition range were determined by X-ray diffraction and electron probe microanalysis. The experimental results indicated a ternary compound τ 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 °C. The two terminal solid solutions (bcc-(Ta) and β-Ti) formed a continuous solid solution at 1000 and 1200 °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 °C.
Key words: microstructure; Ni-Ti-Ta ternary system; isothermal section phase diagram; electron probe microanalysis
