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Linking first-principles energetics to CALPHAD: An application to thermodynamic modeling of the Al-Ca binary system

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Abstract

First-principles (FP) energetics of both the constituent elements and the compounds in the Al-Ca binary system are used in the CALPHAD (CALculation of PHase Diagrams) approach of thermodynamic modeling. First-principles calculations are performed using both an all-electron full-potential linearized augmented plane-wave method, as well as an ultrasoft pseudopotential/plane wave method. We perform calculations of T=0 ground state total energies of the pure Al and Ca in fcc, bcc, and hcp structures, and the binary compounds in their observed crystal structures. Al4Ca, Al14Ca13, and Al3Ca8 are modeled in CALPHAD as simple stoichiometric compounds; however, the Laves C15 compound, Al2Ca, is modeled using two sublattices (Al,Ca)2(Al,Ca)1, necessitating first-principles energies of both the stable Al2Ca compound as well as the three nonstable Al2Al, AlCa2, and Ca2Ca compounds. From these total energies, we obtain the formation enthalpies of all the binary compounds that are then used to assist in evaluating the Gibbs energy functions for the individual phases. The entropy contribution in the Gibbs energy function for each individual compound is obtained via the observed equilibria with the liquid phase. We provide a complete thermodynamic description of the Al-Ca binary system, evaluated by this combined CALPHAD-FP approach.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, The Pennsylvania State University, 16802, University Park, PA

    Koray Ozturk, Yu Zhong, Long-Qing Chen & Zi-Kui Liu

  2. Materials Research Institute & Department of Physics, The Pennsylvania State University, 16802, University Park, PA

    Jorge O. Sofo

  3. Ford Research and Advanced Engineering, MD3083/SRL, 48121-2053, Dearborn, MI

    C. Wolverton

Authors
  1. Koray Ozturk
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  2. Yu Zhong
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  3. Long-Qing Chen
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  4. Zi-Kui Liu
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  5. Jorge O. Sofo
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  6. C. Wolverton
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Ozturk, K., Zhong, Y., Chen, LQ. et al. Linking first-principles energetics to CALPHAD: An application to thermodynamic modeling of the Al-Ca binary system. Metall Mater Trans A 36, 5–13 (2005). https://doi.org/10.1007/s11661-005-0133-0

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  • DOI: https://doi.org/10.1007/s11661-005-0133-0

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