Magnetic contributions to the thermodynamic functions of alloys and the phase equilibria of Fe-Ni system below 1200 K

Critical evaluation of the Fe–Ni, Fe–Ti and Fe–Ni–Ti alloy systems

“…Solid state equilibria were discussed previously by Rossiter and Jago [31]. The presence of a miscibility gap, induced in the gamma phase by the magnetic transition, was suggested by CALPHAD-type thermodynamic calculations [32,33] and subsequently confirmed by experimental investigations [34] on stable and metastable equilibria in meteoritic samples in the 200e700 C temperature range (Figs. 1 and 2).…”

“…Initial CALPHAD-type thermodynamic assessments [32,68,33] have been improved by Lee and Lee [69], who described the ordered FeNi 3 phase and the disordered fcc phase as one phase, and re-optimised the liquid parameters. Subsequently Ohnuma et al [70,71], re-modelled the magnetic contribution to the Gibbs energy of the ordered FeNi 3 phase.…”

Exchange-induced phase separation in Ni–Cu films

“…Nevertheless, it was predicted [4] that in Ni x Cu 1−x alloys with (0.86 < x < 0.91) a metastable miscibility gap should exist due to magnetic interactions. For describing the magnetic contribution to the free energy, the authors of [4] used a model proposed by Chuang [12,13]. The model contains an empirical expression for the heat capacity of a ferromagnetic alloy, with adjustable parameters obtained from the experiment.…”

Solid-state synthesis and phase transformations in Ni/Fe films: Structural and magnetic studies

“…Because of the extremely sluggish kinetics of phase formation in the low-and middle-temperature region (To500 1C), the phase diagram of the Fe-Ni system is still poorly determined [1,2]. It is known that, the Ni 3 Fe fcc phase with a ¼ 0:35525 nm is formed in nickel-rich region ($75 at% Ni).…”