Aero Engine Corporation of China - Science and Technology on Advanced High Temperature Structural Materials Laboratory; University of Science and Technology Beijing - Beijing Advanced Innovation Center for Materials Genome Engineering
Beijing University of Technology - Institute of Microstructure and Property of Advanced Materials
Abstract
Rhenium is the key element for improving the mechanical properties in γ/γ'-structured single-crystal Ni-based superalloys, but its oxidation-induced evaporation results in a detrimental decrease in corrosion resistance. The in situ Re evaporation process of a single lamella of a high Re-containing Ni-based superalloy is recorded with an environmental transmission electron microscope, and volatilization is observed. The local aggregation of Re in the inner border of the γ phase and subsequent evaporation forms channels for the accelerated oxidation of the base and other elements. The real oxidation process of Re evaporation provides detailed and essential information on corrosive gas resistance properties at the nanoscale.
Keywords: Superalloy, Oxidation, Rhenium, Interface segregation, Transmission electron microscopy
Chen, Yanhui and Zhang, Wenhan and Zhao, Yunsong and Zhai, Yadi and Zhang, Bin and Lu, Hui and Yang, Guo and Yang, Luyan and Li, Ang, Oxidation-Induced Rhenium Evaporation in Ni-Based Single Crystal Superalloy Thin Lamella. Available at SSRN: https://ssrn.com/abstract=3860380 or http://dx.doi.org/10.2139/ssrn.3860380
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