Abstract Scanning electron microscopes (SEM) and transmission electron microscopes (TEM) were employed to investigate the topologically close-packed (TCP) phases in an experimental nickel base single crystal superalloy. Orientation relationships between P phase and matrix were found as (010)P//(1 1 ‾ 1)γ and [201]P//[110]γ, in which atomic arrangement of P phase obtains the optimal matching with that of γ/γ’ matrix and the semi-coherent interface forms, achieving the lower interface energy. The elemental composition, atomic arrangement of low index planes and the atomic attachment of P phase with matrix were analyzed in detail to investigate the atomic scale structure of the fast-growing semi-coherent interface and its effects on precipitate growth. Finally, the nucleation of P phase was discussed.

中文翻译：

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Ni基单晶高温合金中P相拓扑密堆积相的表征和析出行为

摘要 采用扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM) 研究了实验性镍基单晶高温合金中的拓扑密堆积 (TC​​P) 相。P相与基体的取向关系为(010)P//(1 1 ‾ 1)γ和[201]P//[110]γ，其中P相的原子排列与γ的原子排列得到最佳匹配/γ'矩阵和半相干界面形成，实现较低的界面能量。详细分析了元素组成、低折射率面的原子排列以及P相与基体的原子附着，研究了快速生长的半相干界面的原子尺度结构及其对析出物生长的影响。最后讨论了P相的成核。