Thermodynamic modeling of the Co–Ni–Y system

Experimental and Thermodynamic Assessment of the Nb-Ni-Y System

“…1 [14] and was updated very recently. [15] It is accepted in the present work with a minor adjustment of parameters of Ni 17 Y 2 phase to provide a match between experimental and calculated tie-lines in the Ni-rich part of the ternary Nb-Ni-Y system. This modification results in somewhat different values of the enthalpy and entropy of formation of the Ni 17 Y 2 compound, but not in any changes in calculated phase diagram (Fig.…”

“…4 reveals that the extrapolating calculation is already in agreement with experiment, except the phase relations in the Ni corner. According to the published thermodynamic description of Ni-Y system, [15] Ni 17 Y 2 forms tie-lines with NbNi 3 (dashed line in Fig. 4) instead of experimentally confirmed Ni 17 Y 2 -(Ni) equilibrium.…”

“…[17] The interaction parameters 0 L fcc Nb;Y and 0 L cph Nb;Ni were given large positive values to avoid the artificial stabilization of fcc and cph phases in the Nb-Y and Nb-Ni systems, respectively, and in the adjacent regions of the Nb-Ni-Y system. For the NbNi 3 and l-phase, the two and five sublattice models were used as originally proposed by Joubert et al, [8] while all other phases, that is, NbNi 8 , [8] and Ni-Y intermetallics [15] were treated as stoichiometric compounds. The temperature of 750°C was chosen to ensure that all alloys were completely in the solid state.…”

First-principles calculations and thermodynamic modeling of the Re–Y system with extension to the Ni–Re–Y system

“…The modeling uses the NieY database from Du and Lu [42] and the NieRe system from Huang and Chang [43]. However, in the NieRe system, the description of the pure elements is from the second version of the SGTE SSUB pure element database [18], while the phase descriptions of the pure elements of the NieY and ReeY systems are from the most recent version, version four.…”

“…Ternary interaction parameters in the hcp, fcc, and liquid solid solutions were not introduced. The Gibbs energy parameters for the NieY systems can be found in the paper by Du and Lu [42]. After constructing the ternary description from the three binary systems, a stable bcc phase formed in the NieRe binary system.…”