A low-density single crystal (LDS) alloy with the composition of high Mo content was designed. The extra 1.5 wt% Mo was added in the Alloy A with the composition of Ni–6.5Al–8.0Mo–2.4Cr–6.2Ta–4.9Co–1.5Re–(0.01–0.05)Y (wt%) to study the influence of Mo on the lattice parameter and partitioning behavior. Scanning electron microscope (SEM) with energy-dispersive spectrometer (EDS), transmission electron microscopy (TEM) and high-temperature X-ray diffraction (HT-XRD) were used to observe the microstructure, analyze the elemental content and measure the lattice parameter of the alloys. The natural lattice misfit was calculated by lattice constants which were measured by HT-XRD at the temperature from 25 to 1150 °C, and the results showed that the lattice misfit would be more and more negative with temperature increasing. It was found that 1.5 wt% addition of Mo will increase the absolute value of the lattice misfit of γ/γ′ phases and the volume fraction of γ′, and at the same time, influence the elemental distribution in γ and γ′ phases, especially Re and Cr. Re has a higher partitioning ratio ( k ) after the addition of Mo.

中文翻译：

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不同Mo添加量Ni基高温合金中γ/γ′相的分配行为和晶格错配

设计了一种具有高 Mo 含量组成的低密度单晶 (LDS) 合金。在合金 A 中添加额外的 1.5 wt% Mo，成分为 Ni–6.5Al–8.0Mo–2.4Cr–6.2Ta–4.9Co–1.5Re–(0.01–0.05)Y (wt%) 以研究其影响Mo 对晶格参数和分配行为的影响。采用扫描电子显微镜（SEM）、能谱仪（EDS）、透射电子显微镜（TEM）和高温X射线衍射（HT-XRD）观察微观结构，分析元素含量，测量晶格参数的合金。自然晶格错配是通过在 25 到 1150 ℃的温度下通过 HT-XRD 测量的晶格常数计算的，结果表明随着温度的升高，晶格错配会越来越负。结果发现，1。添加5wt%的Mo会增加γ/γ'相的晶格错配的绝对值和γ'的体积分数，同时影响γ和γ'相中的元素分布，尤其是Re和Cr . 添加 Mo 后 Re 具有更高的分配比 (k)。