Phase equilibria in Co-rich region of Co-Ti-Ta system

The phase equilibria in Co-rich region of Co-Ti-Ta system were studied. The microstructure and XRD analysis together with EDS determination show that L1 2 type Co 3Ti phase and Laves_C36_Co 3Ta phase get equilibrium with α-Co phase from 1 000 to 1 200 °C. The Co 3Ti phase possesses a solubility of T...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2011-11, Vol.21 (11), p.2391-2395
Main Authors: JIANG, Min, SAREN, Gerile, YANG, Su-yu, LI, Hong-xiao, HAO, Shi-ming
Format: Article
Language:English
Subjects:
China
Co-based superalloys
Co-Ti-Ta
Cobalt
Construction
L1 2 type intermetallic compound
Microstructure
Nonferrous metals
Phase equilibria
phase equilibrium
Solubility
Tantalum
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Summary:The phase equilibria in Co-rich region of Co-Ti-Ta system were studied. The microstructure and XRD analysis together with EDS determination show that L1 2 type Co 3Ti phase and Laves_C36_Co 3Ta phase get equilibrium with α-Co phase from 1 000 to 1 200 °C. The Co 3Ti phase possesses a solubility of Ta higher than 10%, and the addition of Ta stabilizes the Co 3Ti phase. The isothermal sections of the Co-Ti-Ta system in the Co-rich region at 1 000, 1 100 and 1 200 °C were constructed according to the result.
ISSN:1003-6326
DOI:10.1016/S1003-6326(11)61025-X