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SUCCESS SECRET

NUST MISIS Scientists present metal

glasses for heavy-duty coating of

gadgets

A new method for processing
bulk metal glasses was proposed by
scientists from NUST MISIS. According
to the authors, they managed to
find production conditions that
significantly improve the quality of
these promising materials. They can
be used as coatings for expensive
smartphones, tablets, as well as
the manufacture of biocompatible
implants. The research results
are published in the of Alloys and Metallic glasses (amorphous metals) are materials
Compounds. that, in contrast to "classical" materials, have no
regularity in the arrangement of atoms far apart from
each other. Because of this, they are distinguished by
high strength, elasticity, resistance to corrosion and
other properties, due to which they are in demand
in instrument making, mechanical engineering, medicine and magnetic
electrical engineering.
One of the obstacles to the widespread use of these materials is their
high fragility. The study authors believe that a new method of processing
metal glasses will help solve this problem. The method was tested on an
amorphous alloy of the zirconium-copper-iron-aluminum system (Zr-Cu-
Fe-Al).
"The use of annealing before and after rolling was ‘prohibited’ by the canons of the
science of metallic glasses, since in the vast majority of cases this leads to their embrittlement.
The choice of the alloy composition and the alloying system helped us to get around this
problem: annealing at about 100 degrees below the glass transition temperature made it
possible, instead of embrittlement, to achieve plasticization of bulk samples and hardening of
tape samples", explained Dmitry Luzgin, the research supervisor, Doctor of Technical Sciences,
Professor of NUST MISIS.
According to the authors of the study, the characteristics of the obtained material are
influenced by the method of decomposition of the alloy matrix - strip or bulk. Depending on
this, different results are achieved.
"For bulk samples, by dividing a homogeneous amorphous phase into two, an increase in
tensile plasticity of up to 1.5% at room temperature was achieved. For tape samples, an increase
in hardness of 25% was achieved, which is ensured by the separation of glassy nanoparticles
of about 7 nm in size of the secondary amorphous phase with retention of plasticity bending
and compression. This is an unexpected and very significant result ", said Andrey Bazlov, the
author of the method, a researcher at the Department of Metallurgy of Non-Ferrous Metals,
NUST MISIS.
The alloy of the Zr-Cu-Fe-Al system cannot be used as the main structural material due to
its high cost, the authors of the development explain, but they are confident that the proposed
technology can be applied to other amorphous alloys, in particular, titanium (cheaper).
The new method will simplify the process of imparting the necessary properties to metal
glasses, thereby expanding the scope of their use. In the future, the research team intends to
apply the new technology for the production of titanium and other volumetric metallic glasses
of improved quality.

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