摘要
采用分离式Hopkinson压杆(SHPB)对AZ31B热轧板材沿轧向进行冲击实验,加载应变率约为1 200 s-1.利用金相显微镜和透射电子显微镜观察微观组织特征。结果表明:在应变量约为0.003的条件下,压缩孪生{101-1}/<101-2>与拉伸孪生{11-02}/<1 1-01>均为孪生塑性变形机制,这与准静态加载下单一的拉伸孪生机制不同。孪晶内部的微观特征演化过程包括:1)平行排列基面层错的出现;2)与孪晶界成特定角度平行排列位错线的形成;3)位错胞的产生。
Dynamic mechanical properties of AZ31B sheet were carried out in compression along rolling direction using split Hopkinson bar（SHPB） at the strain rate of 1 200 s-1.Post-mortem observations were conducted using optical microscope and transmission electron microscope.The results show that both {10 11}/10 1-2 and {1 1-02}/10 1-1 twinning are the plastic deformation mechanisms at the strain of 0.003,which is different from the {10 12}/10 1-1 twinning deformation mechanism under quasi-static loading condition.The evolution of microstructure inside twinning consists of parallel basal stacking faults,parallel dislocation arrays of different orientations to twin boundary and dislocation cells.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2009年第9期1223-1226,共4页
Acta Armamentarii
关键词
金属材料
压缩孪生
拉伸孪生
位错胞
基面层错
metallic material
tensile twinning
contraction twinning
dislocation cells
basal stacking faults
