Microstructural Effect of Magnetic Properties of FeCo-based Soft Magnetic Alloys

We have systematically investigated the effect of microstructure on the magnetic properties of FebalCo49V1.9, FebalCo49V1.9Nb0.3, FebalCo27Cr0.6Ni0.6, FebalCo27Cr0.6Ni0.6C0.3 alloys in a temperature range of 20-700 °C. The effects of microstructure, the grain size, second phase precipitation, density of dislocation, and structural ordering parameter have been separated each other and been determined. The second phase precipitation which appears in high temperature aged samples causes the magnetic properties to deteriorate significantly. The increase of the structural ordering parameter, which was determined by neutron diffraction, improves the magnetic properties. The grain size mainly affects the coercivity field.