This production closed-die forging program was established. for the purpose of determining the forging characteristics and properties of two high temperature magnesium alloys, HM21XA and EK31XA, in five sets of commercial design tools. Both cast and extruded material were used as forging stock. Test specimens for room and elevated temperature testing were taken from the forgings in normal production test locations after the HM21XA forgings were aged to the -T5 temper and the EK31XA forgings were heat treated to the -T6 condition.nEK31XA alloy is readily forgeable in regular hydraulic presses and the Air Force heavy presses with stock temperatures of 750-950F and die temperatures of 700-850F. HM21XA alloy is relatively stiff to forge in this temperature range and the alloy is also sus¬ceptible to cracking when subjected to bending moments during the forging cycle. The cast forms of both alloys are slightly stiffer to forge than the extruded forms.
展开▼
