Abstract
Abstract The Ru–Zr system has been critically assessed by means of the CALPHAD technique. Based on the experimental data, the solution phases (liquid, body-centered cubic, hexagonal close-packed) were initially modeled with the Redlich–Kister equation. It was shown that this model had a definite temperature range beyond which the liquid became unstable. To tackle the problem, the solution phases were modeled with a new semi-empirical equation, which was recommended by Kaptay. A two-sublattice model (Ru, Zr) 0.5 (Ru, Zr) 0.5 is applied to describe the compound RuZr in order to deal with the order–disorder transition between body-centered cubic solution (A2) and RuZr with CsCl-type structure (B2). Another two-sublattice model (Ru, Zr) 0.6667 (Ru, Zr) 0.3333 is applied to describe the compound Ru 2 Zr in order to cope with the order–disorder transition between hexagonal close-packed (A3) and Ru 2 Zr with MgZn 2 -type structure (C14). A set of self-consistent thermodynamic parameters of the Ru–Zr system was obtained.
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