Thermodynamic assessment of the Hf–Os system

The Hf–Os system was critically assessed by means of the calculation of phase diagram (CALPHAD) technique. The solution phases (liquid, body-centered cubic and hexagonal close-packed) were modeled with the Redlich–Kister equation. A three-sublattice model (Hf, Os) 0.5(Hf, Os) 0.5Va 3 is applied to d...

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Bibliographic Details
Published in:Journal of alloys and compounds 2006-01, Vol.407 (1), p.188-192
Main Authors: Guo, Cuiping, Du, Zhenmin
Format: Article
Language:English
Subjects:
CALPHAD technique
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Hf–Os phase diagram
Materials science
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Phase diagrams of metals and alloys
Physics
Thermodynamic assessment
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Summary:The Hf–Os system was critically assessed by means of the calculation of phase diagram (CALPHAD) technique. The solution phases (liquid, body-centered cubic and hexagonal close-packed) were modeled with the Redlich–Kister equation. A three-sublattice model (Hf, Os) 0.5(Hf, Os) 0.5Va 3 is applied to describe the intermediate B2 compound HfOs in order to cope with the order–disorder transition in the Hf–Os system. Using this model, the ordered B2 and the disordered Hf-rich bcc are described by a single Gibbs energy function. The intermetallic compound HfOs 2, which has a homogeneity range, was treated as the formula (Hf, Os)(Hf, Os) 2 by a two-sublattice model with Hf and Os on the first and second sublattices, respectively. The compound Hf 54Os 17 was treated as stoichiometric compound. A set of self-consistent thermodynamic parameters of the Hf–Os system was obtained.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2005.06.034