Abstract
Ultrahigh strength amorphous alloys Fe65.9Cr11.6Si7.5B15 and Co43Ta5.5Fe20B31.5 prepared by rapid quenching have the form of ribbons with thickness of about 40 micrometers with some imperfections in the sample width and the cross section. Fractographic analysis of Co- and Fe-based high strength soft magnetic materials showed the high localization of the plastic deformation and the ductility in narrow shear bands. To estimate the fracture stress, the Vickers microhardness and the average width of dimples (or the wavelength of the vein features) on the fracture surface were used. Based on the microhardness, the tensile yield strength was calculated as 4 and 5 GPa for Fe-based and Co-based glass, respectively. We estimated the fracture toughness from the measured mean value of the dimple size.
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