Abstract: Taking extruded and homogenized Mg-Al-Zn-0.1Y magnesium alloy as research object, hot deformation behaviors of the alloy under isothermal hot compression at 250-400 ℃ and 0.01-10 s^-1 were studied by using a Gleeble 3500 thermal simulator to establish Arrhenius constitutive equations and processing maps, and effect of homogenization heat treatment on its deformation texture was studied by electron backscattered diffraction (EBSD). Based on the established processing map at strain of 0.5 which represents the steady-state flow, the results show that the homogenization treatment broadens the low-temperature processable zones and improves the low temperature processability of the alloy, the suitable processing zones of the as-extruded alloy are (325-375 ℃, 0.01-0.1 s^-1) and (350-375 ℃, 1-10 s^-1), and the optimum processing zone of as-homogenized alloy is (275-325 ℃, 0.01-0.1 s^-1). The EBSD results show that the homogenization treatment improves the dynamic recrystallization ability of the alloy, weakens the texture strength of the base surface of the extruded alloy, increases the proportion of soft orientation, and improves the hot formability of the extruded magnesium alloy.

Key words: rare earth microalloyed magnesium alloy, homogenization treatment, hot deformation, processing map, texture