Application of ab initio and CALPHAD thermodynamics to Mo-Ta-W alloys

P. E.A. Turchi, V. Drchal, J. Kudrnovský, C. Colinet, Larry Kaufman, Zi-kui Liu

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

A parameter-free electronic structure approach is applied to the study of stability and chemical order in substitutional bcc-based Mo-Ta, Ta-W, and Mo-W alloys. The method is based on a Green's function description of the electronic structure of random alloys. Configurational order is treated within the generalized perturbation method, and temperature effects are accounted for by a generalized mean-field approach. The practical application of this study to phase stability in Mo-Ta-W alloys is tested by converting the ab initio output thermodynamics of the three binary subsystems to a format amenable to a CALPHAD treatment. The results of this conversion are then used to predict isothermal sections of the ternary phase diagram of the Mo-Ta-W system that are compared with the results obtained directly from the ab initio approach with the cluster variation method. It is concluded that the proposed CALPHAD conversion of the ab initio results is a viable scheme to capture the alloy properties predicted from first-principles electronic structure calculations.

Original languageEnglish (US)
Article number094206
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number9
DOIs
StatePublished - Mar 1 2005

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Thermodynamics
Electronic structure
thermodynamics
electronic structure
cluster variation method
Phase stability
Green's function
Thermal effects
Phase diagrams
format
temperature effects
Green's functions
phase diagrams
perturbation
output

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Turchi, P. E.A. ; Drchal, V. ; Kudrnovský, J. ; Colinet, C. ; Kaufman, Larry ; Liu, Zi-kui. / Application of ab initio and CALPHAD thermodynamics to Mo-Ta-W alloys. In: Physical Review B - Condensed Matter and Materials Physics. 2005 ; Vol. 71, No. 9.
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Application of ab initio and CALPHAD thermodynamics to Mo-Ta-W alloys. / Turchi, P. E.A.; Drchal, V.; Kudrnovský, J.; Colinet, C.; Kaufman, Larry; Liu, Zi-kui.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 71, No. 9, 094206, 01.03.2005.

Research output: Contribution to journalArticle

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AU - Drchal, V.

AU - Kudrnovský, J.

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AU - Kaufman, Larry

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