Shear bands in magnesium alloy AZ31

来源期刊：中国有色金属学报(英文版)2004年第5期

论文作者：杨平 毛卫民 任学平 唐全波

文章页码：851 - 857

Key words：magnesium alloy; deformation; texture; microstructure

Abstract: During deformation of magnesium at low temperatures, cracks always develop at shear bands. The origin of the shear bands is the {101^-1} twinning in basal-oriented grains and the mobility of this type of twin boundary is rather low. The most frequent deformation mechanisms in magnesium at low temperature are basal slip and {101^-2} twinning, all leading to the basal texture and therefore the formation of shear bands with subsequent fracture. The investigation on the influences of initial textures and grain sizes reveals that a strong prismatic initial texture of 〈0001〉 parallels to TD and fine grains of less than 5 μm can restrict the formation and expansion of shear bands effectively and therefore improve the mechanical properties and formability of magnesium.