Structure and physical properties of Fe-based metallic glasses with Ni and Co addition

Purpose: The main aim of the paper was investigation of structure and physical properties of Fe-based metallic glasses with Ni and Co addition. Design/methodology/approach: The structure was characterized by X-ray diffraction (XRD) method, transmission electron microscope (TEM), scanning electron microscope (SEM). The measurement of physical properties (magnetic and mechanical) were made. The magnetic properties contained initial magnetic permeability μi, coercive force Hc and magnetic after-effects Δμ/μ measurements were determined by the Maxwell-Wien bridge, coercivemeter and with the use of automatic device for measurements magnetic permeability, respectively. Microhardness tests were performed on Vickers microhardness tester. Findings: The XRD and TEM investigations revealed that the studied ribbons were amorphous. The SEM images showed that studied fractures morphology of ribbons is changing from smooth fracture inside with narrow dense veins pattern on surface having contact with the copper roller during casting to fine (shell) chevron pattern on surface freely solidified. The changing of chosen soft magnetic and mechanical properties obtained for samples with different thickness is a result of the non-homogenous amorphous structure of tested metallic glasses. Practical implications: The successful preparation of the Fe-based metallic glasses with Ni and Co addition from industrial raw materials will benefit cost-effective development of functional ferromagnetic materials and may be utilized in construction of magnetic cores such as common mode choke coils and noise filters. Originality/value: In this work, an attempt has been made to prepare the Fe-based metallic glasses more economically by means of replacement of high purity materials with industrial materials (ferroalloys).