Spinodal decomposition in ternary Fe-Cr-Co system

Model of Decomposition of Alloy with Two Magnetic Components: the BCC FeCr System

“…It follows from formulas ( 6)-( 13) that magnetism leads, first of all, to a change in the mixing energy within the considered model; moreover, the latter turns out to be dependent on the temperature and the concentrations of the components due to the adopted form of correlators ( 8) and (12) with Weiss fields (10).…”

“…In this study, we restrict ourselves to analyzing the states of the FeCr alloy at temperatures substantially higher than the Néel temperature of chromium (T N = 311 K) and assume that the short-range antiferromagnetic order in this case is absent or negligible at any concentration. Therefore, the effective Weiss fields around atoms of each type can be determined without accounting for the difference in magnetic sublattices, as follows: (10) where the mean value of the reduced magnetic moment (…”

“…To select the optimal composition and heat treatment conditions that provide the required properties of alloys, a deep understanding of physical mechanisms that determine the formation and stability of their structural state is required. The enthalpy of mixing of the Fe-Cr alloy in the para-and ferromagnetic states was calculated within the density functional the-ory (DFT) in [4,10,11]. It was shown that the mixing energy of the Fe-Cr binary alloy depends significantly on the chromium concentration.…”

“…It was shown that the mixing energy of the Fe-Cr binary alloy depends significantly on the chromium concentration. According to the results of ab initio calculations, the enthalpy of mixing increases by a factor of approximately 1.5 (at a chromium concentration of 50 wt %) upon the transition from the paramagnetic to ferromagnetic state and, on the contrary, it decreases and becomes negative at a chromium concentration of less than 10 wt % [4,10]. As shown in [12], the anomalous behavior of the enthalpy of mixing can be explained within the framework of a model that takes into account the temperature dependence of the magnetic contribution.…”

Nanoscale Phase Evolution during Continuum Decomposition of Fe-Cr Alloys

“…The composition is a dominant factor for the decomposition kinetics [ 9 ]. Therefore, the phase separation dynamics in Fe-Cr alloys are potentially useful for predication of the morphology evolution and property change, and much attention has been focused on this question [ 10 , 11 , 12 , 13 , 14 , 15 ].…”