Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy
Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy
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DOI：
10.1007/s11661-017-4336-y
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发表时间：
2018-03-01
影响因子：
2.8
通讯作者：
Stone, H. J.
中科院分区：
文献类型：
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作者：
Goodfellow, A. J.;Galindo-Nava, E. I.;Stone, H. J.
镍基高温合金的显微组织稳定性对于在燃气涡轮机发动机中使用期间保持合金性能至关重要。在这项研究中，沉淀物的演变模型多晶镍基高温合金在时效至1000小时已通过透射电子显微镜，原子探针断层扫描，和中子衍射研究。在老化过程中观察到相组成和沉淀物形态，尺寸和体积分数的变化，而约束晶格失配保持恒定在约为零。γ基质相的实验组成与热力学平衡预测一致，而γ '相的实验结果与预测结果之间存在显著差异。这些结果的演变的机械性能在服务和他们的预测使用建模方法的影响。(C)作者（S）2017
The microstructural stability of nickel-based superalloys is critical for maintaining alloy performance during service in gas turbine engines. In this study, the precipitate evolution in a model polycrystalline Ni-based superalloy during aging to 1000 hours has been studied via transmission electron microscopy, atom probe tomography, and neutron diffraction. Variations in phase composition and precipitate morphology, size, and volume fraction were observed during aging, while the constrained lattice misfit remained constant at approximately zero. The experimental composition of the gamma matrix phase was consistent with thermodynamic equilibrium predictions, while significant differences were identified between the experimental and predicted results from the gamma' phase. These results have implications for the evolution of mechanical properties in service and their prediction using modeling methods. (C) The Author(s) 2017.