Abstract L12 structured γ′ phase is the main strengthening phase of Ni-base superalloys, which contain multiple alloying elements. Locations of these elements in the lattice are crucial for understanding the mechanical/physical properties of γ′ phases. Here, we reveal the site occupancy of various elements in γ′ phases of two multi-component Ni-base single crystal superalloys by using advanced scanning transmission electron microscopy and energy disperse spectroscopy. Cr, Mo, Re, Ta, W and Ti atoms preferentially locate at Al sublattices, and Co and Ru atoms prefer Ni sublattices. Moreover, the addition of Ru does not affect the site occupancy of other alloying elements.

中文翻译：

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镍基单晶高温合金γ′相合金元素的位点占有率

摘要 L12结构γ′相是Ni基高温合金的主要强化相，含有多种合金元素。这些元素在晶格中的位置对于理解 γ' 相的机械/物理特性至关重要。在这里，我们通过使用先进的扫描透射电子显微镜和能量色散光谱揭示了两种多组分 Ni 基单晶高温合金的 γ' 相中各种元素的位点占有率。Cr、Mo、Re、Ta、W 和 Ti 原子优先位于 Al 亚晶格中，而 Co 和 Ru 原子更喜欢 Ni 亚晶格。此外，Ru 的加入不影响其他合金元素的位点占有率。