Effects of Si on Solidification Structure and Soft Magnetic Property of Cu-10Fe Alloys
Effects of Si on microstructure,solidification behavior,mechanical and soft magnetic properties of Cu-10Fe alloy were investigated by optical microscope,electron probe analysis,X-ray diffractometer,phase diagram calcula-tion,universal mechanical testing machine and vibrating sample magnetometer.The results indicate that with the increase of Si content from 0 to 2%,the mass fraction of Fe-rich phase is increased from 7.39%to 9.27%.Meanwhile,the growth of Fe-rich dendrites is inhibited,which is transformed from developed dendrites to cellular dendrite mor-phology with lower shape anisotropy,resulting in the enhancement of soft magnetic properties.The calculation of phase diagram reveals that the area of immiscible region continues to expand with Si addition,indicating the significant liquid-liquid phase separation.Fe-rich phase collides and aggregates during the solidification process,leading to the increase firstly and then decrease of microstructure uniformity and properties.The as-cast Cu-10Fe-1Si alloy exhibits the optimal comprehensive performance,where the tensile strength and saturation magnetization are 338.7 MPa and 17.28 emu/g,respectively,which are 11.3%and 21.9%higher than those of Cu-10Fe alloy.The coercivity is 13.75 Oe,which is 49.9%lower than that of Cu-10Fe alloy.
Cu-10Fe-x Si AlloysMicrostructureMechanical PropertiesSoft Magnetic Properties
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