Abstract
An analysis is made of the effect of the ferromagnetic transition on the thermodynamics of equilibrium grain boundary segregation in dilute binary alloys of iron. The chemical potentials of the species involved are considered in terms of their magnetic and non-magnetic components using the approach of Nishizawa. These chemical potentials are then used to calculate segregation free energy and grain boundary solute concentrations. The analysis predicts that magnetic contributions in these binary systems can be significant, particularly for those solute elements which markedly affect the Curie temperature. In solutions containing solutes which lower the Curie temperature, for example phosphorus, strong grain boundary segregation is predicted up to temperatures several hundreds of degrees higher than would be the case in the absence of magnetic effects. The analysis also predicts a possible transition in the boundary.
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