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

### **Alexandr Aronin and Galina Abrosimova \***

Structure Research Lab., Institute of Solid State Physics RAS, Chernogolovka 142432, Russia; aronin@issp.ac.ru **\*** Correspondence: gea@issp.ac.ru; Tel.: +74-9652-28462

Received: 6 February 2020; Accepted: 4 March 2020; Published: 9 March 2020

**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 e ffect 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.

**Keywords:** metallic glasses; nanoglasses; structure evolution; properties
