Thermodynamic re-assessment of the Al-Ir system

T. Abe, C. Kocer, M. Ode, H. Murakami, Y. Yamabe-Mitarai, K. Hashimoto, H. Onodera

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Abstract

The thermodynamic assessment of the Al-Ir binary system was performed using the CALPHAD technique. The B2-AlIr phase was described, using the two sublattice model with the formula (Al,Ir,V a)1/2(Al,Ir,V a)1/2, while Al9Ir2, Al3Ir, Al13Ir4, Al45Ir13, Al28Ir9, and Al2.7Ir compounds were treated as stoichiometric compounds. The fcc-based phases (L10-AlIr, L12-Al3Ir, L12-AlIr3 and A1) were described using the four sublattice model with the formula, (Al,Ir)1/4(Al,Ir)1/4(Al,Ir)1/4(Al,Ir)1/4. From ab initio calculations (VASP) the formation enthalpies of the stable/metastable intermetallic phases involved in the Al-Ir system were estimated. The thermodynamic quantities, such as the phase equilibria, invariant reactions, and formation enthalpies of the intermetallic phases, were calculated using the obtained parameter set, and agree well with experimental data.

Original languageEnglish
Pages (from-to)686-692
Number of pages7
JournalCalphad: Computer Coupling of Phase Diagrams and Thermochemistry
Volume32
Issue number4
DOIs
Publication statusPublished - 2008 Dec 1

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Keywords

  • Ab initio calculations
  • Bond coat material
  • Refractory alloy
  • Structural vacancy

ASJC Scopus subject areas

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

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