Constitutive equations in creep of Mg–Al alloys

摘要: Abstract The creep response of commercial Mg–Al alloys for die-casting was described by taking into account the distinctive microstructure consisting α-Mg primary grains and a divorced eutectic formed supersaturated β-Mg 17 Al 12 typical these materials. were assimilated to soft zones in composite reinforced hard rich precipitates, latter being grain boundary regions . Constitutive equations correlating minimum rate, applied stress temperature derived dilute solid solutions used calculate forward acting regions, respectively, on assumption that both with similar strain rate. role particles then expressed threshold stress; as consequence, Si addition resulted substantial increase zones, mechanism explains reduction rate observed high-temperature low-stress regime Mg–Al–Si compared Mg–Al–Zn alloys.