Abstract The precipitation and growth morphology of topologically close-packed (TCP) phases in a Re-containing Ni-based single crystal superalloy during thermal exposure were studied. The alloy was found to develop acicular-shaped coherent μ phase particles along γ directions of the matrix after exposure at 950 °C. P phase precipitates were found to form with increased time and at higher temperatures, and in different morphologies, including acicular shaped particles along γ and γ directions, and plate-like particles in {110}γ planes of the matrix. The different P phase precipitates were found to have different lattice constants and different lattice correspondences with the matrix. The μ phase precipitate was also found to have different lattice correspondences with those reported in the literature. The multiplicity of lattice correspondences for the same TCP phase is attributed to the different lattice parameters, which render the precipitates to have different coherency relationships with the matrix.

中文翻译：

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镍基单晶高温合金中 TCP 相析出形态的最小界面失配准则

摘要 研究了含 Re 镍基单晶高温合金在热暴露过程中拓扑密堆积 (TC​​P) 相的析出和生长形态。发现该合金在 950 °C 下暴露后沿基体的 γ 方向发展出针状相干的 μ 相颗粒。发现随着时间的增加和温度的升高，P 相沉淀物会形成不同的形态，包括沿 γ 和 γ 方向的针状颗粒，以及基体 {110}γ 平面中的板状颗粒。发现不同的 P 相沉淀物具有不同的晶格常数和不同的与基体的晶格对应关系。还发现 μ 相沉淀物与文献中报道的那些具有不同的晶格对应关系。