The study of influence of temperature and speed conditions on the mechanical properties of bioresorbable Zn–4Ag–Cu zinc alloy during equal-channel angular pressing

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Abstract

Recently, innovative medical techniques for restoring lost functions of patients have been actively developed, in which the use of bio-soluble (bioresorbable) materials is of particular importance. Such materials include alloys based on Mg, Fe, and Zn, and can significantly reduce the cost of surgical operations and shorten the duration of treatment. However, these metals have such disadvantages as insufficient strength and increased fragility to be used in medical implants. Therefore, increasing the mechanical characteristics of bioresorbable alloys is an urgent problem. In this work, the authors solve this problem using an advanced method of plastic treatment – severe plastic deformation (SPD), which, due to active initial structure refinement to nano- and ultrafine state, allows effective improvement of the mechanical strength of metal materials. The authors used the most effective and well-spread SPD method –equal-channel angular pressing (ECAP). The paper presents the results of computer ECAP research of Zn–4Ag–Cu zinc alloy at different deformation rates (0.4 and 7.8 mm/sec) and temperature conditions (150, 200 °C) chosen based on equipment performance potential and conditions to ensure thermal stability of the structure. The patterns of distribution of accumulated deformation degree, deformation rate, average stress values, and temperature-force conditions are obtained. According to the results of computer modeling, the authors recommended carrying out ECAP processing at the temperature of 150, 200 °C and a speed of 0.4 mm/s, which ensures a uniform thermal field at the deformation zone. During the experimental work according to the selected modes, the authors obtained samples after four ECAP cycles, which had advanced mechanical properties improving performance characteristics. The increased strength will allow minimizing the implants’ sizes ensuring less trauma during their installation and faster dissolution in the physiological environment of the body when retaining functionality.

About the authors

Elvira I. Fakhretdinova

Ufa State Aviation Technical University, Ufa

Author for correspondence.
Email: yelka89@mail.ru
ORCID iD: 0000-0001-9007-7391

PhD (Engineering), junior researcher, senior lecturer of Chair of Materials Science and Physics of Metals

Россия

Elvira D. Khafizova

Ufa State Aviation Technical University, Ufa

Email: ela.90@mail.ru
ORCID iD: 0000-0002-4618-412X

PhD (Engineering), senior researcher

Россия

Rashid N. Asfandiyarov

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

Email: a.r.n@list.ru
ORCID iD: 0000-0002-5522-4314

PhD (Engineering), junior researcher, assistant professor of Chair of Materials Science and Physics of Metals

Россия

Georgy I. Raab

Nosov Magnitogorsk State Technical University, Magnitogorsk

Email: giraab@mail.ru

Doctor of Sciences (Engineering), leading researcher

Россия

Rinat K. Islamgaliev

Ufa State Aviation Technical University, Ufa

Email: saturn@mail.rb.ru

Doctor of Sciences (Physics and Mathematics), professor of Chair of Materials Science and Physics of Metals

Россия

Aleksandr S. Semenov

Mirny Polytechnic Institute (branch) of North-Eastern Federal University, Mirny

Email: sash-alex@yandex.ru

PhD (Physics and Mathematics), Associate Professor, Director

Россия

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