Deep drawability of AZ31 magnesium alloy sheets at elevated temperatures

AZ31 magnesium alloy sheets with a thickness of 0.8 mm were prepared through hot-rolling process. For the determination of the mechanical properties relevant to deep drawing of AZ31 magnesium alloy, uniaxial tensile tests were carried out under various temperatures and strain rates. Deep drawing tests for AZ31 magnesium alloy were conducted in a temperature range between 50 ℃ and 240 ℃. The effects of forming temperatures, deep drawing speeds and punch temperatures on deep drawing process were experimentally investigated. It is indicated that the limiting drawing ratio(R_(LD)) significantly increases with the increase of temperatures. The maximum R_(LD) can be raised up to 2.65 with the corresponding height-diameter ratio of 1.4 under a deep drawing speed of 30 mm/min at 200 ℃, thus showing good formability of AZ31 magnesium alloy sheet. Further, deep drawing speeds and punch temperatures during deep drawing process can also exert significant influence on the deep drawing of AZ31 magnesium alloy.