Local magnetic deterioration on work-hardening layer of FeSiB metallic glass by milling

FeSiB metallic glass has good soft magnetic properties as a magnetic core material because of high permeability of amorphous matrix. Plastic-strain induced local magnetic deterioration by milling should be prevented. This work presents the results on local magnetic deterioration in the work-hardening layer. Local magnetic fields and crystallization conditions were characterized by micro magnetic induction tests and electron backscatter diffraction, respectively. By utilizing the brittleness of the nanocrystalline during the ductile-brittle transition, high speed milling with speed of 1.5 m/s successfully increased the brittleness of the metallic glass, which led to a thin work-hardening layer with less magnetic deterioration.