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Thermodynamic description of the aluminum–rhenium system

  • Rkia TamimEmail author
  • Kamal Mahdouk
  • Samira Otmani
  • Khadija Achgar
Article

Abstract

Phase relationships in the Al–Re binary system have been thermodynamically reassessed by using the CALPHAD technique to take into account the most recent experimental data in the Al-rich part. A new version of the Al–Re phase diagram considering the congruent melting of the Al11Re4 as well as the modified temperatures and nature of some equilibria has been obtained. The Redlich–Kister polynomials were used to describe the excess Gibbs energy of the liquid phase as well as the fcc_A1 (Al) and hcp_A3 (Re) terminal solid solutions. The l-Al4Re, h-Al4Re and Al3Re phases, which have a homogeneity range, were treated by a two-sublattice model with the respective formulae: Al0.8(Al, Re)0.2, (Al, Re)0.77(Al, Re)0.23 and (Al, Re)0.75(Al, Re)0.25. The five remaining intermediate compounds were considered as stoichiometric. The calculated phase diagram and the generated thermodynamic parameters were critically compared with the experimental data available in the literature. Finally, our results were also confronted to the computed ones by Huang and Chang on the basis of thermodynamic quantities derived from the controversial model of Miedema and coworkers.

Keywords

CALPHAD Al–Re Thermo-Calc Redlich–Kister equation Thermodynamic assessment 

Notes

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Rkia Tamim
    • 1
    Email author
  • Kamal Mahdouk
    • 1
  • Samira Otmani
    • 1
  • Khadija Achgar
    • 1
  1. 1.Laboratory of Thermodynamics and Energetics, Faculty of SciencesIbn Zohr UniversityAgadirMorocco

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