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Thermodynamic assessment of the Co-Ta system

Published

Author(s)

Peisheng Wang, J?rg Ko?mann, Ursula R. Kattner, Mauro Palumbo, Thomas Hammerschmidt, Gregory B. Olson

Abstract

The Co-Ta system has been reviewed and the thermodynamic description was re-assessed in the present work. DFT (density functional theory) calculations considering spin polarization were performed to obtain the energies for all end-member configurations of the C14, C15, C36 and μ phases for the evaluation of the Gibbs energies of these phases. The phase diagram calculated with the present description agrees well with the experimental and theoretical data. Considering the DFT results was essential for giving a better description of the μ phase at lower temperatures.
Citation
Calphad-Computer Coupling of Phase Diagrams and Thermochemistry
Volume
64

Keywords

TCP phase, ?-?’, Co-based superalloys, CALPHAD
Created December 20, 2018, Updated February 12, 2019