Аннотация:The interest to magnetic metallic amorphous alloys (MMAAs) was born after the publication of
A. Gubanov in 1960 [1]. Nowadays soft magnetic metallic amorphous alloys with excellent properties,
such as high saturated magnetic flux density, low coercivity and high permeability, are of great
potential to be used both in various electric devices, such as transformers, reactors, motors, actuators,
and mutual inductors, and in sensor of magnetic field, tension, stresses, temperature and so on.
There are many factors which affect on the properties of MMAAs and all of them require careful
study with a different methods.
In our researches we considered a wide variety of the physical effect for the estimation the processes
in the MMAA and their connection with magnetic properties.
Plastic deformation, especially severe plastic deformation, is a complex process which not only
leads to shaping of a deformed solid object but also causes substantial variations in the structure and
properties of the object material. In MMAAs deformation stimulates mass transfer and change in the
chemical composition both at the macro- and microscale levels. In turn, redistribution of the solid
solution components during plastic deformation may change their magnetic properties.
The formation of near-surface layers, losing their plasticity, but occurring in the amorphous state
different from the initial state, is the main feature of ductile-brittle transition of MMAAs after their annealing
from the macroscopic point of view. Microscopic process causing this transformations can be
presented as a formation of clusters of a new amorphous phase with the increase content of metalloid
atoms. These clusters have dimensions of some of a few tens of nm and act as stress concentrators,
that leads to the crash failure of MMAAs under the action of the loading.
The effect both low temperature quenching and annealing on MMAAs property irreversible changes
depends on the parameters of the treatment (temperature and duration) and the chemical composition
of the alloys.
Support by RFBR grant no 18-02-00137 is acknowledged.
1. A.I. Gubanov, Fiz. Tverd. Tela 2, 502–513 (1960).
