Specific Features of Structure Transformation and Properties of Amorphous-Nanocrystalline Alloys

Abstract

This work is devoted to a brief overview of the structure and properties of amorphous-nanocrystalline metallic alloys. It presents the current state of studies of the structure evolution of amorphous alloys and the formation of nanoglasses and nanocrystals in metallic glasses. Structural changes occurring during heating and deformation are considered. The transformation of a homogeneous amorphous phase into a heterogeneous phase, the dependence of the scale of inhomogeneities on the component composition, and the conditions of external influences are considered. The crystallization processes of the amorphous phase, such as the homogeneous and heterogeneous nucleation of crystals, are considered. Particular attention is paid to a volume mismatch compensation on the crystallization processes. The effect of changes in the amorphous structure on the forming crystalline structure is shown. The mechanical properties in the structure in and around shear bands are discussed. The possibility of controlling the structure of fully or partially crystallized samples is analyzed for creating new materials with the required physical properties.

Mechanical Behavior of Fe- and Co-Based Amorphous Alloys after Thermal Action

“…In turn, this leads to significant changes in the properties of AAs. At present, there remain topical and controversial issues related to the ductile-brittle transition of AAs and their deformation behavior upon the transition from the amorphous to the nanocrystalline state [9][10][11][12][13]. Plastic deformation in AAs occurs mostly according to the dislocation-free mechanism due to the formation and development of strongly localized shear bands in the absence of strengthening effects [14].…”

Recent Advancements in Metallic Glasses

“…Aronin and Abrosimova [4] present a brief overview of the structure and properties of amorphous-nanocrystalline metallic alloys. The transformation of a homogeneous amorphous phase into a heterogeneous phase, the dependence of the scale of inhomogeneities on the component composition, and external influences are considered.…”