EFFECT OF ECAP ON THE MICROSTRUCTURE, MECHANICAL AND CORROSION PROPERTIES OF MG-ZN-CA AND MG-ZN-CA-MN BIODEGRADABLE ALLOYS

1 KOLTYGIN Andrey
Co-authors:
1 BAZHENOV Viacheslav 2 KOMISSAROV Alexander 1 KHASENOVA Regina 1 ANISHCHENKO Alexey 2 FOZILOV Bunyodbek 3 BAUTIN Vasiliy 3 SEFERYAN Alexander 4 BILYALOV Azat
Institutions:
1 National University of Science and Technology, Foundry Department, Moscow, Russian Federation
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
4 Bashkir State Medical University, Department of Traumatology and Orthopedics, Ufa, 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:
1388-1393
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:
25 views / 4 downloads
Abstract

The Mg – 2.2-3.8 wt.% Zn – 0.3-0.7 wt.% Ca – 0-0.9 wt.% Mn alloys as a material for the production of biodegradable implants was investigated. Equal-channel angular pressing (ECAP) to improve the grain structure and mechanical properties of the alloys was used. The microstructure and phase composition of alloys were determined using scanning electron microscopy and energy dispersive X-ray spectroscopy. The phase diagrams and alloys phase composition were calculated using the Thermo-Calc software. For the alloy sample, a differential thermal analysis (DTA) was carried out. The mechanical properties and corrosion properties of ECAP processed alloys were investigated. In vitro corrosion test by hydrogen evolution method was carried out in Hank’s solution. The alloys containing Mn were composed of primary solid solution (Mg), manganese particles (Mn) and eutectic (Mg) + (Mn) + Ca2Mg6Zn3. The alloys without Mn were composed of primary solid solution (Mg) and eutectic (Mg) + Ca2Mg6Zn3. The alloys have a wide equilibrium crystallization range of about 250 °С. The solute treatment of alloys leads to an increase of the zinc concentration in the (Mg) solid solution. Calcium and manganese are slightly soluble in (Mg) solid solution. The obtained samples of Mg-Zn-Ca and Mg-Zn-Ca-Mn alloys have ultimate strength (UTS) from 220 to 240 MPa, and elongation (El) from 17 to 29 % after ECAP. The corrosion test was executed for 192 hours. All investigated alloys showed approximately the same result. The manganese addition didn't affect the corrosion resistance of the investigated alloy after ECAP.

Keywords: Biodegradable magnesium alloys, Mg-Zn-Ca-Mn, Mg-Zn-Ca, ECAP, corrosion
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