Superplastic Behavior in Commercial Wrought Magnesium Alloys

Superplastic behavior of five commercial wrought magnesium alloys in as-received condition were examined to grasp the ability of superplastic forming. The materials used in the present study was an AZ31 rolled sheet, an AZ31 extruded rod, an AZ61 rolled sheet, an AZ61 extruded sheet and a ZK60 extruded rod. All the materials have been tested at different temperature and strain rate ranges where their respective superplastic behavior could be obtained. The tensile tests revealed that all the materials exhibited high ductility at about 673 K with elongations-to-failure of over 200%. The results indicated that the commercial wrought magnesium alloys have a potential for superplastic forming. However, strain rate for the maximum elongation was in the range of 10 exp -4 to 10 exp -5 s exp -1 except ZK60 extruded rod, that exhibited the maximum elongation at a relatively high strain rate of 10 exp -3 s exp -1 . Further grain refinement is required to perform high-strain-rate superplastic forming using commercial wrought alloys.