Effect of Extrusion Temperature on Microstructure and Biodegradation Behavior of Mg-5Zn-1Y-1Ca Alloy

Abstract

Abstract-In this years, many researches on the biodegradable behavior of Mg and its alloys has been done. Low corrosion resistance of the magnesium alloys has led to search a new generation of magnesium alloys for better strength, ductility, and high corrosion resistance. In this study, Mg-5Zn-1Y-1Ca alloy was fabricated by melting process and hot extrusion (at 300, 330 and 370 °C). The effect of temperature of extrusion on microstructure and degradation behavior of Mg-5Zn-1Y-1Ca alloy were investigated by optical microscopy, scanning electron microscopy with an energy dispersive X-ray spectroscopy, X-ray diffraction, immersion test and electrochemical test. The results showed that Mg-Zn-Y-Ca alloy was composed of α-Mg, Mg 3 YZn 6 phase and Ca 2 Mg 6 Zn 3 particles. Immersion and electrochemical tests showed that extruded Mg-5Zn-1Y-1Ca alloy at 330 °C exhibited the best degradation resistance from other alloys in this study.