Thermodynamic assessment of the CuFeNi system

Determination of displacements from nanoprecipitates in a Cu–Ni–Fe single crystal using anomalous small-angle and large-angle X-ray scattering

“…Having gained con®dence in our methodology, we have decided to apply it to a much more demanding subject: the case of a ternary alloy. In a previous study (paper I), we had shown that the Cu±Ni±Fe system is an interesting case: the decomposition follows the tie-line of the calculated phase diagram (Chart et al, 1982;Servant et al, 2000), in agreement with atomic probe measurements of the solute concentrations (Wagner et al, 1984;Lopez et al, 1993). We have also shown, however, that this description is a rough ®rst approximation: this system does not simply decompose into well de®ned precipitates (enriched in Ni and Fe), embedded in a Cu matrix, itself depleted in solute elements.…”

“…Following the calculated phase diagram of the Cu±Ni±Fe system (Chart et al, 1982;Servant et al, 2000), the decomposition results in a mixture of a Cu-rich matrix and Fe±Ni-rich precipitates, with the corresponding solute concentrations: in the matrix, c m Fe < 1%, c m Cu 9 85% and c m Ni 9 15%; in the precipitates, c p Fe 9 27%, c p Cu 9 12% and c p Ni 9 60%, leading to a volume fraction of $0.58. This means that the Fe parameters are characteristic of the precipitates themselves, while the Cu parameters are characteristic of the matrix only.…”

Thermodynamic Description of the Al-Fe-Mg-Ni-Si and Al-Cu-Fe-Mg-Ni Quinary Systems and Its Application to Solidification Simulation

“…The Fe-Ni phase diagram has been constructed by several groups [12][13][14] by means of CALPHAD approach. Servant et al [12] assessed the Fe-Ni system using a foursublattice model to describe the order/disorder transformation. Keyzer et al [13] calculated the stable Fe-Ni phase diagram showing a large discrepancy between computed and experimental melting equilibria.…”

“…Cacciamani et al [14] also assessed the Fe-Ni system using a four-sublattice model to describe both stable and metastable fcc-based ordered phases as well as the bcc-based ordered phases. Zhang and Du [15] have been converted the parameters of the Ni 3 Fe phase in the Fe-Ni system [12] from a four-sublattice formalism to a two-sublattice one in order to maintain the consistency with the other binary systems. Considering of the accuracy of the thermodynamic parameters and the consistency of the models, the thermodynamic parameters in the Fe-Ni system were taken from Zhang and Du [15] based on the modeling of Servant et al [12] in the present work.…”

“…Zhang and Du [15] have been converted the parameters of the Ni 3 Fe phase in the Fe-Ni system [12] from a four-sublattice formalism to a two-sublattice one in order to maintain the consistency with the other binary systems. Considering of the accuracy of the thermodynamic parameters and the consistency of the models, the thermodynamic parameters in the Fe-Ni system were taken from Zhang and Du [15] based on the modeling of Servant et al [12] in the present work. The widely accepted thermodynamic assessment of the Fe-Si system was from Lacaze and Sundman.…”