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.
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