Superplasticity at Intermediate Temperatures of ZK60 Magnesium Alloy Processed by Indirect Extrusion

Magnesium alloys usually exhibit excellent superplasticity at high temperature. However, many Mg have poor formation ability near room Therefore, preparation of with suitable microstructures to show low or intermediate temperature is an important goal. In this work, the superplastic behavior temperatures a commercial ZK60 magnesium alloy processed by indirect extrusion was investigated. After extrusion, showed refined and homogeneous microstructure average grain size 4 ± 2 ?m. Overall texture measurement indicated that strong prismatic highest intensity oriented pole ?101¯0?. A component ?1¯21¯1? parallel direction found; type commonly observed in rare earth additions. Tensile tests were performed 150, 200, 250 °C three strain rates 10?2, 10?3, 10?4 s?1. very ductility found s?1, resulting elongation failure 464%. Based on calculations activation energy interpretation deformation mechanism map for alloys, it concluded boundary sliding (GBS) dominant mechanism.