Microstructures and magnetic properties of Fe-49%Sn monotectic alloys solidified under a high magnetic field

A high magnetic field can make the morphology of Fe-rich dendrites in Fe-49%Sn (mass fraction) alloy change obviously and magnetic property improve. The morphology of Fe-rich phase without field is dendrites in random and partially net structures. With the increase in the imposed magnetic flux density, the alignment of the Fe-rich dendrites paralleled to the imposed field is more obvious, and the relative intensity of the (110) plane of α-Fe phases in XRD pattern strengthens, which are related to the increase in magnetic crystalline anisotropy energy induced by the field. The estimated magnetic crystalline anisotropy energies from hysteresis loops of Fe-49%Sn alloys are consistent with the analytical results. Moreover, XRD analysis showed the Fe-49%Sn alloy are composed of α-Fe, β-Sn, and intermetallic compounds FeSn and FeSn2, which is independent of magnetic flux density.