Abstract
The Ru–X (X = Al, Hf, Mo, Ti) systems were re-optimized by means of the CALPHAD method according to the experimental phase equilibria and thermochemical data, as well as updated Gibbs energy function of “GBCCRU” in SGTE Pure 5 database. The substitutional solution model was applied to the phases liquid, fcc_A1, bcc_A2 and hcp_A3. Besides, the phases Al6Ru, Al13Ru4, Al5Ru2, Al2Ru and Al3Ru2 in the Ru–Al system were modeled as stoichiometric compounds and the phase Mo5Ru3 (σ) in the Ru–Mo system was described as (Mo,Ru)10(Mo,Ru)20 and (Mo,Ru)10(Mo,Ru)4(Mo,Ru)16 using the two-sublattice and three-sublattice models, respectively. The phases AlRu, HfRu and RuTi with the bcc_B2 crystal structure were treated as the ordered ones of bcc_A2. The reliable thermodynamic parameters of these binary systems were obtained, which could be used as the basis for thermodynamic calculations of high-order systems and database establishment of Ni-based superalloys.
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