中文摘要：

利用扫描及透射电子显微技术对点冲击变形Mg-Y1.5-Nd0.6-Zn0.4合金的显微结构特征进行了研究。结果表明点冲击变形镁合金的主要变形模式包括形成孪晶与剪切带。其中孪晶的主要类型为{1121}、{1011}与{1012}孪晶。此外,孪晶与剪切带之间存在交互作用,进而在一定程度上改变孪晶相对基体的取向差。

英文摘要：

Deformation microstructural features of the Mg-Y1. 5-Nd0. 6-Zn0. 4 alloy subjected to impact deformation have been investigated by means of EBSD and TEM techniques. The results show that the dominant deformation modes under impact deformation include twinning and shear-band formation processes. The presence of { 1011},{ 1012} and { 1121} twin after the impact deformation are identified by EBSD analysis. It is observed that a deformation twin can interact with shear bands in different ways,which gives rise to a twinning deviation to some degree with respect to the matrix.