中文摘要：

在铸造Mg-Zn-Cu-Zr合金100℃时效过程中观察到生长孪晶，采用光学显微镜和透射电子显微镜表征生长孪晶的形貌和位向。结果表明：在铸态和固溶态的Mg-Zn-Cu-Zr合金中未发现生长孪晶，仅在时效态合金中出现{1012}型生长孪晶。Zn 含量和热处理工艺显著影响其孪生行为。最后，从空位角度讨论此类生长孪晶可能的生长机制。

英文摘要：

The morphology and orientation of the growth twins formed in the cast Mg-Zn-Cu-Zr alloys aged at 100 ＆#176;C were characterized using optical microscopy and transmission electron microscopy. It was found that twins were invisible in the as-cast or solutionized Mg-Zn-Cu-Zr alloys while {10 12} twins were exclusively formed in the aged condition. The twinning behavior was significantly affected by two factors, namely, the Zn content and the heat treatment process. A possible formation mechanism of such growth twins was discussed using the viewpoint of vacancy.