EFFECT OF CRYSTALLIZATION ON THE ELECTRICAL RESISTANCE AND STRUCTURE OF AMORPHOUS Fe-Co-Cr-B-Si ALLOYS

摘要

The goal of this paper is to present the influence of temperature variation and iron substitution with Co on the structure and electrical properties of amorphous Fe_(75-x)Co_xCr_1B_7Si_(17) alloys (where x=l, 4, 7, and 10 at.%), obtained by melt-spinning technique. The electrical resistivity of the samples was measured by using a usual four-probe method from -160°C to 750°C. The electrical resistivity was also measured at room temperature for the amorphous Fe_(75-x)Co_xCr_1B_7Si_(17) ribbons annealed at various temperatures for different holding time. The annealed samples were also investigated by Vickers microhardness test. The amorphous structure of tested materials was examined by X-ray diffraction (XRD), Mossbauer spectroscopy, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) methods. Experimental results confirmed the utility of applied investigation methods and the influence of the Co content and annealing process on the crystallization, structure and electrical properties of examined amorphous alloys.