中文摘要：

通过原位拉伸高分辨透射电镜观察,研究纳米孪晶铜中孪晶界的动态形变过程。实验发现,与以往分子动力学模拟计算预测的结果不同,Shockley不全位错主要从孪晶界与晶界的交叉点处发射,沿着孪晶界面运动,导致孪晶界移动。并对孪晶界移动作为纳米孪晶铜在塑性变形初期的一种主要形变方式进行了讨论。

英文摘要：

The dynamical deformation process of twin boundaries （TBs） in nanoscale growth twin Cu was investigated by in situ high resolution transmission electron microscopy. TB migration via Shockley partial dislocations emitted from the TB/grain boundary intersections and twin steps was found to be the dominant deformation mechanism in the initial stage of plastic straining. It is different from the previous deformation mechanism given by molecular dynamics simulations.