摘要
采用分离式Hopkinson压杆测试了AZ31镁合金板材的动态学性.使用金相显微镜观察微观组织特征.压缩方向与板面法向近似成0°,加载应变率为1200s-1时,变形局域化区域由孪晶组成;应变率为2800s-1时,由相互交叉成一定角度的孪晶带组成.压缩方向与板材法向成90°,加载应变率为1200s-1时,变形局域化区域由相互交叉成一定角度的孪晶组成;加载应变率为2800s-1时,由动态再结晶的小晶粒组成.压缩方向与板面法向成45°时,没有观察到类似的变形局域化.变形局域化降低了AZ31B镁合金的塑性,导致板材塑性各向异性.
Dynamic mechanical performances of AZ31 plate were carried out using Split Hopkinson pressure bar and Optical microscope was used for microstructure observation. The localized deformation zone consists of twinning at a strain rate of 1 200 s -1 and consists of intersection twinning at a strain rate of 2 800 s-1 ,with the loading direction 0° from normal direction of the plate. The localized deformation zone consists of intersection twinning at a strain rate of 1 200 s-1 and recrystal grain at a strain rate of 2 800 s-1 ,with the loading direction 90° from normal direction of the plate. No similar localized deformation zone was observed, with the loading direction 45° from normal direction of the plate. The formation of localized deformation zone lowered the plasticity of AZ31 magnesium alloy, which resulted in plasticity anisotropy of the plate.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第2期264-268,共5页
Journal of Nanjing University（Natural Science）
关键词
高应变率
变形局域化
孪晶
动态再结晶
high strain rate, localized deformation, twinning, recrystallization
