First-principles calculations, experimental study, and thermodynamic modeling of the Al-Co-Cr system

Xuan L. Liu, Thomas Gheno, Bonnie B. Lindahl, Greta Lindwall, Brian Gleeson, Zi-kui Liu

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The phase relations and thermodynamic properties of the condensed Al-Co-Cr ternary alloy system are investigated using first-principles calculations based on density functional theory (DFT) and phase-equilibria experiments that led to X-ray diffraction (XRD) and electron probe micro-analysis (EPMA) measurements. A thermodynamic description is developed by means of the calculations of phase diagrams (CALPHAD) method using experimental and computational data from the present work and the literature. Emphasis is placed on modeling the bcc-A2, B2, fcc-γ, and tetragonal-σ phases in the temperature range of 1173 to 1623 K. Liquid, bcc-A2 and fcc-γ phases are modeled using substitutional solution descriptions. First-principles special quasirandom structures (SQS) calculations predict a large bcc-A2 (disordered)/B2 (ordered) miscibility gap, in agreement with experiments. A partitioning model is then used for the A2/B2 phase to effectively describe the order-disorder transitions. The critically assessed thermodynamic description describes all phase equilibria data well. A2/B2 transitions are also shown to agree well with previous experimental findings.

Original languageEnglish (US)
Article numbere0121386
JournalPloS one
Volume10
Issue number4
DOIs
StatePublished - Apr 13 2015

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Thermodynamics
varespladib methyl
thermodynamics
Phase equilibria
Ternary alloys
Order disorder transitions
Electron probe microanalysis
X-ray diffraction
Phase diagrams
Density functional theory
Thermodynamic properties
Solubility
Experiments
electrons
X ray diffraction
liquids
X-Ray Diffraction
Liquids
Electrons
temperature

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Cite this

Liu, Xuan L. ; Gheno, Thomas ; Lindahl, Bonnie B. ; Lindwall, Greta ; Gleeson, Brian ; Liu, Zi-kui. / First-principles calculations, experimental study, and thermodynamic modeling of the Al-Co-Cr system. In: PloS one. 2015 ; Vol. 10, No. 4.
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First-principles calculations, experimental study, and thermodynamic modeling of the Al-Co-Cr system. / Liu, Xuan L.; Gheno, Thomas; Lindahl, Bonnie B.; Lindwall, Greta; Gleeson, Brian; Liu, Zi-kui.

In: PloS one, Vol. 10, No. 4, e0121386, 13.04.2015.

Research output: Contribution to journalArticle

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