On the microstructural origin of stress-induced anisotropy in Co67Fe4Mo1.5Si16.5B11 metallic glass

Abstract X-ray diffraction, Mossbauer spectroscopy and magnetization measurements have been used to obtain complementary information about the changes in magnetic properties and short-range order in metallic glass ribbon of the nominal composition Co 67 Fe 4 Mo 1.5 Si 16.5 B 11 as a result of annealing under tensile stress and without this stress. The results obtained suggest that: (i) annealing results in an increased chemical short-range order in both the samples annealed with and without external stress, (ii) in the stress-annealed sample additional internal stresses are generated which are expected to be oriented preferentially along the external stress axis, (iii) the stress-induced anisotropy is expected to have contributions from both, anisotropic bond reorientation as well as magnetoelastic coupling of the anisotropic internal stresses generated during stress annealing with magnetostriction. However, since magnetostriction in the studied specimens was extremely small, the latter contribution seems to be negligible.