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Fe-6.5wt%Si alloy has excellent soft magnetic properties,but it is hard to be cold-rolled due to appearance of ordered phases in this alloy.In this paper we report that ultra thin Fe-6.5wt%Si sheet of 0.05 mm thick was obtained by heavily cold rolling.By means of optical microscope,micro-hardness indenter,instron,SEM and X-ray diffraction,the effect of heat treatment on mechanical properties of this alloy sheet was investigated.The heavily cold-rolled sheet exhibits some extent of ductility.The ultimate tensile strength reaches 1.93 GPa.After heat treatment,micro-hardness is decreased and the ductility is lost,especially at temperature above 650℃ when recrystallization takes place.The reason for decreasing the ductility lies in the ordered DO3 phase transformation.
Fe-6.5wt% Si alloy has excellent soft magnetic properties, but it is hard to be cold-rolled due to appearance of ordered phases in this alloy.In this paper we report that ultra thin Fe-6.5wt% Si sheet of 0.05mm thick was obtained from heavily cold rolling.By means of optical microscope, micro-hardness indenter, instron, SEM and X-ray diffraction, the effect of heat treatment on mechanical properties of this alloy sheet was investigated. some extent of ductility. The ultimate tensile strength reaches 1.93 GPa. After heat treatment, micro-hardness is decreased and the ductility is lost, especially at temperature above 650 ° C. when recrystallization takes place. The reason for decreasing the ductility lies in the ordered DO 3 phase transformation.