Differential Scanning Calorimetry of the α/γ Transformation in Fe–Co Alloys under a Magnetic Field

Abstract

This study investigates how a magnetic field affects the ¡/£ transformation in FeCo alloys, particularly its entropy of transformation. Pure Fe, Fe9.5 at% Co alloy and Fe19.2 at% Co alloy were analyzed by differential scanning calorimetry in a magnetic field. Both the latent heat and the ¡/£ transformation entropy for pure Fe and FeCo alloys decreased in a magnetic field. These reductions were more pronounced as the Co concentration increased and as the magnetic field strength increased.

High Magnetic Field Effects on the Solid-liquid Reaction of Fe–Ga System

“…It is known that reactions, transformations, and equilibria of the ferromagnetic phase are influenced by application of a magnetic field because of the contribution of Zeeman energy. [8][9][10][11][12][13] Differences of Zeeman energy between ferromagnetic and non-ferromagnetic phases leads to the rise of the A 1 and A 3 lines in the Fe-C system, resulting in a change in the phase diagram. 8) Magnetic-field-induced enhancement of the solid-phase reaction of the Bi-Mn system was found due to the increase of formation rate at grain boundaries…”