The paper presents the transmission electron microscopy investigations of the microstructure and phase composition of the nickel-based superalloy after high temperature annealing. All states of the superalloy are characterized by the single-crystal structure with [001] crystallographic orientation. The Ni–Al–Co alloy system also contains such elements as Mo, Cr, W, Ta, Re and Ru. The Ni–Al–Co system is studied in four states: initial (after directional crystallization) and after 1000°С annealing during 118, 372 and 1274 hours. The major phases forming the alloy system are γ- and γ′-phases. After annealing for 118 hours, the formation of Al6(Re, Ru) phase is observed. After longer high-temperature annealing new phases occur, such as σ-, δ- and Laves phase. The obtained alloy microstructure is classified into four types: 1) γ′-phase quasi-cuboids with γ-phase layers, 2) ribbon anisotropic microstructure of γ′+ γ-phase, 3) ribbon anisotropic microstructure with σ-phase particles in γ-phase layers, 4) γ-phase with δ-phase and Laves phase inclusions. The introduction of a large amount of various alloying elements and the annealing process modify the crystallographic texture of the superalloy.

中文翻译：

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热处理后铼和钌合金Ni-Al-Co体系的显微组织和相组成

本文介绍了镍基高温合金在高温退火后的显微组织和相组成的透射电子显微镜研究。高温合金的所有状态都以具有[001]晶体取向的单晶结构为特征。Ni-Al-Co 合金系统还含有 Mo、Cr、W、Ta、Re 和 Ru 等元素。Ni-Al-Co 系统在四种状态下进行研究：初始（定向结晶后）和 1000°С 退火后 118、372 和 1274 小时。形成合金系统的主要相是γ-和γ'-相。退火118小时后，观察到Al6(Re,Ru)相的形成。经过较长时间的高温退火后，会出现新的相，例如 σ-、δ- 和 Laves 相。得到的合金显微组织分为四种：1) γ'相具有γ相层的准长方体, 2) γ'+ γ相的带状各向异性组织, 3) γ相层中含有σ相粒子的带状各向异性组织, 4) γ相与δ 相和 Laves 相夹杂物。大量各种合金元素的引入和退火工艺改变了高温合金的晶体织构。