In this work, in-situ TEM compression has been carried out to observe the nucleation and movement of dislocations in Mg–Y alloys. The effect of Y contents (0.4 wt% and 4 wt%) on the dislocation behaviour was studied. It was found that a larger yielding stress was needed to activate the slip in the alloy containing 4 wt% Y. The edge dislocations on the pyramidal II plane in Mg-0.4Y alloy assumed an extended locked configuration with line direction parallel to the basal plane, while non-edge segments remained mobile during the compression. In Mg-4% Y alloy, dislocations assumed an oval shape and were associated with enhanced cross-slip activities without the long edge segments parallel to the basal plane frequently seen in the Mg-0.4Y alloy.

中文翻译：

---

Mg-Y 合金中位错的原位 TEM 研究

在这项工作中，进行了原位 TEM 压缩来观察Mg-Y 合金中的位错。研究了Y含量（0.4 wt%和4 wt%）对位错行为的影响。研究发现，需要更大的屈服应力来激活在含有 4 wt% Y 的合金中滑移。边缘Mg-0.4Y 合金中锥体 II 面上的位错呈现延伸锁定构型，线方向平行于基面，而非边缘段在压缩过程中保持移动。在Mg-4%Y合金中，位错呈现椭圆形，并且与增强的横向滑移活动相关，而没有平行于 Mg-0.4Y 合金中常见的基面的长边缘段。