Effect of the strain rate and temperature on the mechanical behaviour of a Mg–5%Zn alloy reinforced with SiC particles

Abstract

Metal matrix composites (MMCs) have been found to be promising candidate for mechanical applications under impact and high temperature conditions beyond those possible with conventional alloys. Magnesium-based composites exhibit high specific properties compared to unreinforced magnesium and magnesium alloys. Both magnesium alloy and the same alloy reinforced with particles of silicon carbide were investigated in quasi-static and impact conditions in the temperature range from −150 to 200 °C. Quasi-static tests were performed on the universal testing machine (Instron), whereas impact tests (up to 700 s −1) were carried out on the split Hopkinson bar. Comparative results are presented in terms of the main mechanical parameters, and quantitative conclusions are obtained of the influence of temperature and strain rate on the mechanical behaviour of these materials.