ABSTRACT

This research aims to improve the mechanical properties and corrosion resistance of magnesium-based composites with addition of zinc, manganese and Sr as alloying elements. Mg-Zn-Mn-Sr composites with pure Mg as control have been fabricated through powder metallurgy route. Alloying elements was added into magnesium matrix. The composites were prepared by mechanical alloying followed by compaction under 650 MPa and sintering at 400°C. The results showed that with addition of alloying elements improve micro-hardness and compressive strength significantly while corrosion resistance of composites is significantly enhanced compared with pure Mg. The Mg-Zn-Mn-Sr composite showed the best properties after coating by niobium nitride compared to pure Mg and Mg-Sr alloy, which show more improvement with micro-hardness, compressive strength and electrochemical test in simulated body fluid showed highly significant improvement in corrosion resistance after coating.

Keywords: niobium nitride, magnetron sputtering, magnesium-strontium, alloy