Enhancement of ZK60 magnesium alloy by hydrostatic extrusion at room temperature

Microstructures,mechanical properties of ZK60 Magnesium alloy by the hydrostatic extrusion at room temperature (HERT) were investigated. The results show that ZK60 alloy can get good surface quality and high tensile strength after HERT. The ultimate tensile strength,yield strength and Vickers hardness values of magnesium alloy increase by 20%,60% and 54%,respectively. And there is twin dynamic recrystallization in the HERT process. The twins and secondary twins can hinder the spreading of cracks. Good metal flow and stress distribution are helpful for the extrusion deformation. Bringing high-density deformation strengthening,the technology of hydrostatic extrusion is an effective way to intensify magnesium alloys.