Structure Evolution of Fe- and Co-Based Amorphous Alloys Studied by the Electrical Resistivity Measurements

Abstract

The subject of this study is the change of the electrical resistivity of Fe-based metallic glasses during heat treatment. Electrical resistivity is a structure-sensitive characteristic of materials. In metallic glasses, the scattering of conduction electrons on the disordered structure is the main mechanism responsible for the electrical resistivity. Hence amorphous metallic alloys have a much higher residual resistivity as compared to their crystalline analogs. It is typical for metallic glasses that the temperature coefficient of resistivity (TRC) is smaller than for the corresponding crystalline materials, and it can be either positive or negative.

Surface Irregularities and Magnetism in Amorphous Metal Foils on Fe Basis

“…Existence of the two interfaces: the contact one which in a certain degree inherits the structure of the cooling drum irregularities, and the free one with the irregularities system is formed during interaction with external medium, proposes existence of non-trivial structuresensitive properties. [2] In this regard of interest are the issues of metal foils physical properties stability [5,6], as well as their correlation with large scale defects structure, related to existence of stratification effects. One of the research aspects in this direction can be interconnection of amorphous foils surfaces morphology with their structure at nuclear level, phase composition and magnetic properties.…”

“…Line width value G, table 1, for all spinning foils in the initial status is higher than in crystalline one α-Fe (G Fe = 0,2 mm/s). This facts points at the presence of Mossbauer atoms position distribution [7] and allows to approximate Mossbauer spectrum by five sub-spectra, which justifies amorphous condition of rapid quenched foils [6]. The main matrix of the researched specimens is comprised of iron.…”