Influence of High Strain Rate on Mechanical Properties of AM60 Magnesium Alloy

Tensile test of AM60 casting magnesium alloy at different strain rates (0.000 1,0.01,300 and 1 400 s-1) were carried out using static tensile testing machine and tensile impact testing machine,and then the stress-strain curves were obtained and the fractures were observed by SEM.The results showed that the yield strength and tensile strength varied slightly with the increass of strain rate at low strain rate or high strain rate.Comparing the results of static state and dynamic state tests,the strain rate influenced the mechanical properties to some extent;while the modulus was not sensitive to the strain rate.Fracture analysis indicated that the modes for static and dynamic fracture were basically the same,and the fracture was a mixture of predominant quasi-cleavage and minor integranular fracture.Typical shrinkage porosity fracture were presented as well.