Thermodynamic description of the aluminum–rhenium system
| Autor: | Rkia Tamim, Khadija Achgar, Kamal Mahdouk, Samira Otmani |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
chemistry.chemical_element Thermodynamics 02 engineering and technology Rhenium 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 010406 physical chemistry 0104 chemical sciences Gibbs free energy symbols.namesake Congruent melting chemistry Homogeneity (physics) symbols Binary system Physical and Theoretical Chemistry 0210 nano-technology CALPHAD Solid solution Phase diagram |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 139:953-961 |
| ISSN: | 1588-2926 1388-6150 |
| DOI: | 10.1007/s10973-019-08538-5 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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