from the conferences organized by TANGER Ltd. provisional website
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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