Abstract
The Ru–Sc system has been critically assessed by means of the CALculation of PHAse Diagram (CALPHAD) technique. The solution phases (liquid, body-centered cubic (bcc) and hexagonal close-packed(hcp)) were modeled with the Redlich–Kister equation. The intermetallic compounds Ru 3Sc 5, RuSc 2, Ru 4Sc 11, Ru 13Sc 57 and Ru 7Sc 44 were treated as stoichiometric. The compound Ru 2Sc, which has a homogeneity range, was modeled using two sublattices (Ru,Sc) 2Sc. A two-sublattice model (Ru,Sc) 0.5(Ru,Sc) 0.5 was applied to describe the intermediate B2 compound RuSc with CsCl-type structure in order to cope with the order–disorder transition in the Ru–Sc system. Using this model, the ordered B2 compound RuSc and the disordered Sc-rich solution bcc are described by a single Gibbs energy function. A set of self-consistent thermodynamic parameters of the Ru–Sc system was obtained.
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