Microhardness distribution over the surface of Zr-based metallic glass exposed to high-pressure torsion

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Abstract

Identifying the peculiarities of the transformation of the structure and properties of bulk metallic glass (BMG) under high-pressure torsion (HPT) is of great interest. It is known that under HPT, the degree of deformation differs from the center to the edge of a disk which leads to the non-uniformity of the structure of obtained specimens. The change in microhardness value indicates the direction of change in BMG structure under the HPT, and the microhardness distribution indicates the HPT-specimen non-uniformity. The aim of the study is to identify the HPT influence on the microhardness value and microhardness distribution over the surface of specimens of amorphous alloys using an example of Vit105Zr-based BMG (Zr52.5Cu17.9Ni14.6Al10Ti5). The authors studied the distribution of microhardness over the surface of Vit105 Zr-based bulk metallic glass (BMG) in the initial state, in the state after HPT at n=1 and n=5 rotations, and after relaxing annealing. The study shows that the initial Vit105 BMG is characterized by a small spread in microhardness values, which indicates the material's high homogeneity. By reducing the excessive free volume, relaxing annealing increases microhardness without a significant increase in the spread of its values. HPT leads to a decrease in the zirconium BMG microhardness, which indicates an increase in the excessive free volume, but, at the same time, increases the uneven microhardness distribution over the specimen, while the microhardness values in one half of the HPT sample (n=1) are higher than in the other one. It demonstrates that BMG specimen deformation during HPT is related to the specific loading mechanisms.

About the authors

Vasily V. Astanin

Ufa State Aviation Technical University, Ufa

Email: v.astanin@gmail.com
ORCID iD: 0000-0001-9282-8806

junior researcher of Chair of Electrical Engineering

Россия

Dmitry V. Gunderov

Ufa State Aviation Technical University, Ufa;
Institute of Physics of Molecules and Crystals of Ufa Federal Research Center of the Russian Academy of Sciences, Ufa

Author for correspondence.
Email: dimagun@mail.ru
ORCID iD: 0000-0001-5925-4513

Doctor of Sciences (Physics and Mathematics), Professor, leading researcher

Россия

Vyacheslav V. Titov

Ufa State Aviation Technical University, Ufa

Email: molotovmelnik@gmail.com
ORCID iD: 0000-0002-4884-6027

postgraduate student of Chair of Materials Science and Physics of Metals

Россия

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