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MICROSTRUCTURE, MECHANICAL AND CORROSION PROPERTIES OF BIODEGRADABLE MG–GA–ZN–X (X = CA, Y, ND) ALLOYS

1 BAZHENOV Viacheslav
Co-authors:
1 KOLTYGIN Andrey 2 KOMISSAROV Alexander 1 ANISHCHENKO Alexey 1 KHASENOVA Regina 2 KOMISSAROVA Julia 3 BAUTIN Vasiliy 3 SEFERYAN Alexander 2 FOZILOV Bunyodbek
Institutions:
1 National University of Science and Technology, Casting Department, Moscow, Russian Federation, v.e.bagenov@gmail.com
2 National University of Science and Technology, Laboratory of Hybrid Nanostructured Materials, Moscow, Russian Federation
3 National University of Science and Technology, Department of Metallurgy Steel, New Production Technologies and Protection of Metals, Moscow, Russian Federation
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
1375-1380
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
475 views / 172 downloads
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Abstract

We investigate the new alloys of Mg–Ga–Zn–X system, where X = Ca, Y and Nd. These alloys can be used as biodegradable materials due to the low cytotoxicity of Zn and Ga and effectiveness of Ga against bone resorption, osteoporosis and Paget’s disease. The microstructure and phase composition of alloys were determined using scanning electron microscopy and energy dispersive X-ray spectroscopy. The as-cast microstructure of Mg – 4 wt.% Zn – 4 wt.% Ga (Mg4Zn4Ga) alloy consists of magnesium solid solution (Mg) and two eutectic phases with composition (Mg,Ga)7Zn3 and (Mg,Zn)5Ga2. For the improvement of mechanical properties the severe plastic deformation technique named equal channel angular pressing (ECAP) was used. Microstructure, mechanical and corrosion properties of ECAP processed alloys were investigated. It was established that the grain sizes differ more than ten times in microstructure of Mg4Zn4Ga alloy after ECAP. The additions of 0.2 – 0.3 wt.% Ca, Y and Nd lead to formation of uniform-sized grains of 5 – 15 μm. Mentioned previously additions do not change the mechanical properties of Mg4Zn4Ga alloy and measured values of ultimate tensile stress (UTS) is 298 MPa, yield stress (YS) is 167 MPa and elongation (El) is 23 % for Mg4Zn4Ga alloy. The hydrogen evolution corrosion test was carried out in Hanks’ solution during 192 h. The additions of 0.2 – 0.3 wt.% Ca, Y and Nd to Mg4Zn4Ga alloy promote the increasing of the corrosion rate for about two times.

Keywords: Biodegradable materials, magnesium alloys, gallium, ECAP, Hanks’ solution

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