FEATURES OF NANOGOMETRY OF THE AMORPHOUS METALLIC ALLOYS SURFACE. BRIEF OVERVIEW

Surface nanogeometry or roughness is an important characteristic of the amorphous alloys (AMA) and it determines their properties, in particular, wear resistance, contact rigidity, corrosion resistance, and other functional characteristics of the surface. The morphology of the AMA surface depends on many factors: the obtaing method of the amorphous alloys, their composition, or AMA modifications. So, for amorphous alloys there are differences in the surface topography between the contact and the outer side of the amorphous tape due to the thermodynamics of the production process, as well as the roughness of the drum surface and its defects. As a result of thermal annealing of amorphous alloys, surface roughness tends to change. Temperature annealing of amorphous tapes at temperatures below the crystallization temperature contributes to a significant improvement in their properties due to the fact that AMA is thermodynamically unstable and the temperature processing of such alloys is accompanied by structural relaxation aimed at achieving a more stable structure. Nanogeometry of the AMA surface determines their physical and chemical properties: mechanical, magnetic, catalytic, and etc. So, the corrosion resistance strongly depends on the quality of the material's surface. Therefore, in order to increase the corrosion resistance, the AMA should have a smoother surface. The magnetic and catalytic properties of the AMA significantly improve by proper heat treatment, because of controled the surface roughness and size of the nanofaze.