In this study, extensive formation of different planar faults and substantial fault intersections were found and examined at atomic resolution in the cubic ZrCo₂ based Laves phase formed in a Co-9Al-9W-2Zr alloy after annealing at 900 ºC. By analysis, it is confirmed that synchro-shear is the mechanism to form twins, extrinsic stacking faults and intrinsic stacking faults in the cubic Laves phase with three equivalent Burgers vectors 1/6<112> Shockley partials available for synchro-shear. But atomic shuffling in the dislocation core region is also required to fit the atomic arrangement in perfect and faulted lattices. Novel types of planar faults featured by a missing single Co-atom layer and a constant gap width are for the first time observed. The missing single layer is believed to be induced by the vacancy segregation on planes, especially on {111} twinning planes. The atoms below the gap shuffle into their new positions with different shuffling vectors to form different types of planar faults. Most intersections in the heat-treated specimen are quite gentle. Only occasionally, incident planar faults pass the barrier planar faults, and W is enriched in the intersection regions. In cases of more complex intersections, synchro-shear and atomic shuffling occur in extrinsic and intrinsic stacking faults as well as in twins, and vacancy diffusion and atom shuffling occur in the novel types of planar faults to form the observed intersection configurations. The extensive formation of planar faults might significantly alter the mechanical behavior and also influence functional properties of Laves phase containing materials.

在本研究中，在 Co-9Al-9W-2Zr 合金中在 900 ℃ 退火后形成的立方 ZrCo ₂基 Laves 相中，发现并以原子分辨率检查了不同平面断层的广泛形成和大量断层交叉。通过分析，证实了同步剪切是在立方Laves相中形成孪晶、外在堆垛层错和内在堆垛层错的机制，三个等效Burgers矢量1/6<112>Shockley偏数可用于同步剪切。但位错核心区域中的原子改组也需要适应完美和缺陷晶格中的原子排列。首次观察到以缺失单钴原子层和恒定间隙宽度为特征的新型平面断层。缺失的单层被认为是由平面上的空位偏析引起的，特别是在{111}孪晶面上。间隙下方的原子以不同的洗牌矢量洗牌到新位置，形成不同类型的平面断层。热处理样品中的大多数交叉点都相当平缓。仅偶尔，入射面断层会穿过障壁面断层，并且 W 在交叉区域富集。在更复杂的交叉点的情况下，同步剪切和原子改组发生在外在和内在堆垛层错以及孪晶中，并且空位扩散和原子改组发生在新型平面断层中以形成观察到的交叉配置。平面断层的广泛形成可能会显着改变机械行为，还会影响含拉夫斯相材料的功能特性。