Experimental study of structural magnesium alloys with high absorption energy under dynamic loading

摘要

Improvement of tensile mechanical properties under dynamic loading is demonstrated for two commercial magnesium alloys. Ductility in magnesium is enhanced by the addition of alloying elements. Further enhancement of ductility can be achieved by the refining grain structures for two commercial magnesium alloys, ZK60 and AZ31. The high ductility of the fine-grained alloy is owing to the absence of macroscopic cracking at mechanical twin boundaries, while the coarse-grained alloy fractured at a smaller strain owing to the stress concentration at twin boundaries. It is noted that the absorption energy per weight in the fine-grained magnesium is twice higher than those of high strength aluminum alloys. It should be expected that the fine-grained alloy exhibits the high speed impact performance during foreign object damage.