Thermodynamic assessment of the Co-Ta system

Peisheng Wang*, Jörg Koßmann, Ursula R. Kattner, Mauro Palumbo, Thomas Hammerschmidt, Gregory B. Olson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)205-212
Number of pages8
JournalCalphad: Computer Coupling of Phase Diagrams and Thermochemistry
Volume64
DOIs
StatePublished - Mar 2019

Keywords

  • CALPHAD
  • Co-based superalloys
  • TCP phase
  • γ-γ’

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Computer Science Applications

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